Let's just examine the layers of this thing:

• Curb Your Enthusiasm is a fictional show about Larry David. In it Larry David plays Larry David, the co-creator of Seinfeld.
• On Curb Your Enthusiasm, Larry David the character divorces his fake wife Cheryl in a parallel to the real life Larry David divorcing his real wife Laurie.
• In order to win back his fake wife, the fake Larry decides to try to have a Seinfeld reunion show.
• Jerry Seinfeld, playing a version of Jerry Seinfeld on Curb, tells the fake Larry David that he said he would never do a reunion because they're always stupid. The real Larry David said the same thing.
• Both the real and the fake Larry David got over it.
• Now, the fake Larry David goes to all the Seinfeld stars, playing fake versions of themselves, trying to convince them to do a fake Seinfeld reunion when they've already agreed to do a real reunion by appearing on the show.
• Faux Jason Alexander wants to be on the fake reunion show to make up for the really disappointing real finale to the original series.
• Ersatz Michael Richards is distracted by pictures of real boobs and he can't concentrate on the fake reunion. It's just like real life!
• What we see is the making of the reunion and all the petty grudges that David stirs up when he brings the old gang back together again.
• The end result is a bunch of fake action surrounding the fake reunion show, but it is really the real reunion, because they're all back.
• But Larry David was never on Seinfeld (at least in a substantial role) and they're making the reunion for NBC even though the show is airing on HBO.
• The whole stunt will end as the characters disappear in a vacuum rift caused by the fission of real and fake in mass quantities that is the Seinfeld reunion on Curb Your Enthusiasm.

So, Seinfeld on Curb Your Enthusiasm has replace the old meta king—Broadway's [title of show] a "musical about two guys making a musical about two guys making a musical"—to become the ultimate in fake/real self-referential comedy. The construct of one show about the maker of a show engulfing both the real and fake versions of his own show is the logical conclusion of this type of comedy, and the Seinfeld/Curb non-reunion reunion is the non plus ultra of the genre. Thanks for killing it, David.

After this, there is officially no more outrageous concoctions of show-with-a-show or actors-playing-themselves that can be made and think it's still original. Congrats, Curb, you've won the Post-Post-Modern Olympics. Now, like Michael Phelps, you must go smoke a lot of pot while counting your gold metals and leave us alone.

The assumption when any television show hit ends its run is that the stars will go on to fame and fortune and other projects. Sometimes that happens and we never hear from them again (see Friends and inexplicably Full House) but when it doesn't, they all rush back to familiar territory to jump start their careers. Here's are scale from the worst to best.

Dynasty
Final Episode: May 1989
Breakout Stars: Heather Locklear, Emma Samms (just kidding)
Reunion: Dynasty: The Reunion aired in August 1991. The came back for another go-round Dynasty Reunion: Catfights and Caviar in 2006.
Cause: There were some cliffhanger plotlines to tie up, and really, nobody was doing anything else. Also, shoulder pads were about to go out of style, so they had to do it to save on the wardrobe budget.
Held Out: 2 years
Respectability: So bad it's campy.

Firefly
Final Episode: August 2003
Breakout Stars: Does anyone beside us and hardcore Joss Whedon fans even remember this?
Reunion: Serenity hit movie theaters in September, 2005
Cause: To try to get someone, anyone, to finally watch this thing. It failed.
Held Out: 2 years
Respectability: Did it have any to start with?

Sex and the City
Final Episode: February 2004
Breakout Stars: Sarah Jessica Parker, who was the biggest show when the series started. Everyone else found out there really aren't any roles for women over 30.
Reunion: Sex and the City: The Movie came out in May 2008 and broke box office records. A sequel is planned
Cause: These ladies needed a way to make some money. And, obviously, cosmo-swilling Midwestern "fashionistas" demanded it.
Held Out: 4 years.
Respectability: Shameless.

The X-Files
Final Episode: May 2002
Breakout Stars: David Duchovny, who was only a recurring character on the show's final two seasons, is doing quite well on Californication.
Reunion: X-Files: I Want to Believe, the second movie based on the show, failed at the box office in July of 2008.
Cause: We still haven't figured this one out.
Held Out: 6 years.
Respectability: Pretty lame.

Seinfeld
Final Episode: May 1998
Breakout Stars: All of them, but the biggest has been Larry David, now of Curb Your Enthusiasm who wasn't even an actor on the show. Julia Louis-Dreyfuss is still holding down The Adventures of Old Christine. Jerry Seinfeld sits in his house and counts his money, only leaving occasionally to do stand-up, American Express commercials, and The Bee Movie. Jason Alexander had a few failed sitcoms and KFC commercials. Michael Richards had a racist rant that ruined his career.
Reunion: On the cover of Entertainment Weekly August 2009.
Cause: They'll all guest on Curb Your Enthusiasm this year, where a Seinfeld reunion becomes a meta plot point. For a giggle. They're all still rolling in residuals.
Held Out: 11 years.
Respectability: High.

Facts of Life
Final Episode: May 1988
Breakout Stars: Nancy McKeon was a Lifetime fixture before going to rock the tween set on the Disney Channel's Sonny with a Chance. George Clooney did two seasons.
Reunion: The Facts of Life Reunion aired on ABC in November 2001
Cause: Because the gays thought it would be fun and Mrs. Garrett wasn't getting any younger.
Held Out: 13 years.
Respectability: Surprising good. This also seems to be the exception that proves the rule, either that or all the girls have given up on acting careers.

Saved by the Bell
Final Episode: May 1993 (we're not counting The College Years, which ended in 1994)
Breakout Stars: Mark-Paul Gosselaar did the later seasons of NYPD Blue and is now a hit on cable's Raising the Bar. Tiffani Amber Thiessen did 90210, Two Guys, A Girl, and A Pizza Place, Fastlane, and Good Morning, Miami. Elizabeth Berkley did Showgirls and became a Hollywood punchline, Mario Lopez danced with stars, and Dustin Diamond released a sex tape.
Reunion: The cover of People in August 2009.
Cause: Because it was either that or Jimmy Kimmel.
Held Out:16 years.
Respectability: Amazing!

[Criminal Minds]