In a less geeky and more sober mood, I’d agree. The progress of CGI and “because we can (now)” has to be a big part of the current flowering of superhero movies - that and the way Marvel (and DC with Nolan) have treated the genre with more respect than it had previously been treated (getting good directors, actors, scripts, etc.).
Several people have compared the current superhero jag with the great run of Westerns in the early to mid 20th century. I think the difference is in the backward-looking aspect of that mythos, compared to the forward-looking aspect of both superheroes an s-f.
It’s the “modern mythology” aspect of what’s going on that means superhero movies (good ones) are probably going to be a permanent fixture, along with s-f. Even if you think of a genre like romance - why just have a boring romance with boring ordinary life stuff, when you can have it set on Mars, with a sense of wonder?
Our lives, our cities, are increasingly “science fiction”; human enhancement is going to progress apace too, and that’s the unconscious drive behind the superhero mythos per se. All things being equal (no Great Filter, no accidentally pressed nuclear buttons, etc.) that is just going to continue. So long as it continues, the forward-oriented mythologies of superheroes and s-f are going to keep leading it.