While that stuff is somewhat true, it really came down to the actors. Everyone costs more the longer the show runs and above all else, Baldwin was done with the show. Without him, after this long, it just makes sense to end it.
That doesn't jibe with what he has said. He claims he offered to take a significant paycut for it to continue on for two more seasons. Every time a new episode airs and makes me laugh, I can't believe there will be no more 30 Rock soon. So sad.
I knew that when BBT moved, it'd only be a matter of time. I still can't believe how bad the ratings have gotten for 30 Rock.. it's really hard to imagine.