I have a remedy for this problem. Don't see Marvel movies. More specifically, don't see Disney Marvel movies if this is an issue for you.
I'm with B12B, everyone decries the new fad as the end of the damn world of film when it's no different than any other time in history. It's just a fad, it will pass. Personally, I hope it all does blow up in Disney's face because they are just piling on the required viewings before each of the movies or serieses. To the point where you can't watch Agents of Shield without having the newly released movie spoiled for you.
It's eventually going to implode in on itself. It has to. It has gotten too massive and it's only going to get bigger.
But this is just a Marvel movie/show problem, not one afflicting all of cinema.