Yeah, I understand the superhero burnout too - though I've noticed that whenever I'm sick of something (zombies, etc.) the trend probably has another 5 years to go.
Disney is going to lose so much money at some point, with so much crap in the pipeline, so much in development, they'll be several billion in the hole when the trend dies. Of course they've already made billions on superhero movies so that does kind of balance it out, and they're not going anywhere since they're still Disney and they can always just crank out another version of the Lion King or whatever.
I strongly suspect we've already seen the peak of the superhero movies, both in quality and popularity with the whole Thanos saga. None of the upcoming stuff sounds as interesting as that. I wouldn't mind seeing some of the other big comic sagas, like Secret Wars and other big story-lines, but it's going to take them forever to get to those and I'm not so interested in the build-up and filler movies anymore.