Do I think that Sesame Street should be canceled after its 40th season?
Let me put it this way: To me, the "good years" were 1969-1978--well, 1969-1974 being extra crunchy--er, good. Well, 1969-78 was the best time period. But yeah, I agree: whatever goes up must go down eventually. I mean, good things can't last forever (and by that, I mean TV shows) nor should they. Otherwise they'd wind up stale and hard to even enjoy.
Usually, when a new TV show happens, everyone would think: "Oh, I like this. This is good..." As it hits season two, there may be a few changes, and there's some mixed thoughts, but that doesn't matter, because it's still good. Then, usually by the 10th season (MAXIMUM), it'd go ripe, and rot like overexpired cheese.
Look at Scooby Doo: Fans thought the good years were 1969-1978 (or 9, I forgot which). When it first came about, they were into it. There were new spin-offs after the original-few people would have had mixed reactions, but then they'd all agree that it was in the very late 70s that it all got flushed down the toilet (and we all know why)
The Simpsons: the early episodes (Seasons 1-3) were great, as most thought, but as it progressed, there'd be mixed thoughts and by as later as the 11th season, it went downhill. Personally, I disagree with that: Okay, I thought the earlier shows were great, because they had more feeling, emotion, etc. but the newer ones are funnier than ever.
Updating classics from the past is also kinda awkward (well, to me anyway). Take, The Electric Company, for instance: It's lasted for 7 seasons (1971-1977) And years later (now), they're going to revive it. I say, just leave it alone---leave it as it was. it just isn't worth it. But then again, what can you do?
So should Sesame Street go? We know that most of the cast members are getting old, and plus I don't think they can keep up with it FOREVER. So, I wouldn't mind if it was canceled.