Sometimes, it's best for shows to go out when they're on top. Just look at the case of Seinfeld: in the midst of its ninth season, when it was number one with critics and in the ratings, it ended. This seemed abrupt, but star and co-creator Jerry Seinfeld explained that he didn't want the program to linger past the point when it was no longer funny. In retrospect, he may have made the right choice.
Many people thought that 30 Rock was going to do the same thing. Of course, that series isn't nearly as popular as its Must See TV predecessor, but few programs are in this era of more channels and multiple viewing options. Still, star Alec Baldwin was the first to admit that he wanted to only take 30 Rock as far as it could go, and no further. That was one reason to cap its run at seven seasons, the last of which will return later this year.
However, Baldwin seems to have thrown a wrench into that logic, according to Vulture. He apparently tweeted:
I offered NBC to cut my pay 20 percent in order to have full 7th and 8th seasons of 30 Rock.
The wheels are in motion for the show to end this season, so it isn't likely that these comments will extend 30 Rock any longer. Still, with Baldwin interested, who knows what will happen going forward -- maybe Jack Donaghy will get his own spin-off!