The Simpsons is an all-time classic, and deserves to be on the air as long as the staff cares to make it.
I don't tune in every week, and if I happen across it, I still might not watch it everytime. But I'm not arrogant enough to say that because I no longer enjoy it as much as I used to that it should be cancelled.
I can just not watch, and shut the fukk up about it. Y'all should try that.