I don't care what anyone says, Adventure Time, My Little Pony: Friendship is Magic, and Regular Show all have a special place in my heart, along with some outliers like Phineas and Ferb and The Amazing World of Gumball. I just love them for how awesomely absurd and weird they are, it's a style I haven't seen in a long time. All of these have quality animation, quality writing, and quality everything else pretty much. They really are much better than they have any business being. The way I see it, I think there's been a revival to the cartoon genre thanks to these shows as they all bring me back to the days where I'd get up for Saturday morning cartoons. I think you'd be able to do an episode on that whole concept of the Saturday cartoon dieing off until this started, but then again this is probably nostalgia talking.
Speaking of nostalgia, that's really the only reason why I watch the Simpsons anymore. It still makes me laugh occasionally, and it's nice to keep up with it and have something stay consistent in our lives. I do agree that it's more everyone else changing rather than the show, but the characters have also changed either for better or worse. Flanders [http://tvtropes.org/pmwiki/pmwiki.php/Main/Flanderization] is an obvious example. Regardless, it will be a sad day in television history when The Simpsons is eventually canceled. Few shows will ever live up to it.