If they've gone this long with the same quality, I don't know why they'd be interested in stopping in terms of "lack of creativity/quality" or why the people who do drive the numbers for the show would stop watching.
I vividly remember the episode that they went to Toronto as a monumental episode for me in terms of it being a "final nail in the coffin". I think I still continued to watch a little bit after that, but my interest in the show more or less fizzled out completely after that episode. That was Season 13, Episode 11. My opinion of the show from ~Season 14 onward is more or less just catching the odd episode and assuming the show is bad outside of those episodes as well. The golden age of seasons 4-9 or whatever it is seems to ring true for the most part, but there are still quite a few good episodes in the next few seasons after that, it's just really inconsistent.