My response to that is that while I definitely see that argument, I would say that the biggest movies are still the ones which have larger-than-life superheroes. Now, what a superhero can do on screen is wider now than it used to be, although not by much: they can be dorkier, crack nerd jokes, don't need to be big and ripped, etc. But ultimately, Captain America, Iron Man, even Star-Lord, are cool badasses who are pushed as such. Wrestlers are no longer pushed as cool by default; like being a wrestler at the high level by itself makes you cool. That certainly has played a role in wrestling's decline.