Seth MacFarlane has had similar problems with his shows, especially FAMILY GUY: there came a point in time where he felt like enough was enough, and they should just call it a day . . . but FOX isn't about to let that happen . . . and now it's gotten to a point where people actually complain about how the show's lasted too long, has overstayed its welcome, and actually want it to end if only to put it out of its misery. I swear, THE LOUD HOUSE is going to end up like SpongeBob . . . I've heard/read rumors that Chris Savino wanted to end it sooner than later to avoid this very thing from happening, but, well, now that he's fired, guess he has no say in anything about it anymore.
And, as we all know, Jim did the same with TMS as John Cleese with FAWLTY TOWERS: after five seasons and 120 episodes, while still being one of the top-rated shows on television, Jim wisely chose to end it on a high note while it was still popular and successful, rather than run it into the ground to the point people were sick and tired of it. I myself have a number of show concepts and treatments, most of which have only been planned out for a single season for a number of different reasons, but yeah, maintaining quality is one of them.