I'm a huge fan of comic book superhereos (DC, though, not Marvel) and I haven't seen The Hulk, Iron Man, Thor, The Avengers, Captain America, or any of the various material popping up around it.
I think it's fair to say that the moving going audience isn't the same as the comic book audience, which isn't the same as the YA book reading audience. One is comprised of a variety of people, one is mostly male, and the other is mostly female. There's some overlap, sure, but I doubt that superheroes will translate to novels because they're mostly visual and very serial. You can't write a full length novel a month with consistent quality the way you can write/draw a comic book. It's different qualities that attract different audiences.
I mean, if you compare the new DC line of comics to any popular Dystopian YA with powers, you're not going to find many similarities in the content.
1) Superhero comics, with the exception of Static and Spiderman (well, not always) and Young Justice and The Teen Titans and (maybe) X-Men, focus on adults, with adult problems. Even YJ and TT have frequent adult crossovers, and most of the time, they don't really behave like teens. They infrequently focus on problems that older teens would have, and the characters do age past adolescence.
2) There's almost always a romance in any popular YA book. Superhero comics do have romance, but not to the extent of pop YA. Yes, Kid Devil/Slade's Daughter and Superboy/Wonder Girl were an interesting sidetrack to YJ/TT, but they weren't as important as the main plot.
3) Again, the timeline in which comics are published. Once per month, sometimes, bi-weekly.
4) A lot of comics go darker than pop YA, depending on the writer. Novels don't have the freedom that comics do with getting a different writer/artist each week. And, frankly, that's part of what make superhero comics interesting for me. I like reading early Frank Miller, laughing at his latter attempts, reading Grant Morrison's Superman, and comparing Jim Lee's art to the late Mike Turner's.
That being said, it could work, but if you're trying to go traditional superhero in novel form, it's going to very difficult. Teen superheroes have a lot to work around, and most will probably end up with something like that god-awful Sky High bullshit. I've tried writing teen superhereos various times, but it just seems cheesy giving them names and costumes in text. I've always reverted it back to science-fantasy.
ETA: thinking about it, you do have MJ/Peter, Superman/Lois, Batman/various girls, but that depends on the issue, universe, etc. The thing I like about sh comics is the variety, the alterna-universes, and the retcon availablity. The publishing industry doesn't really have the freedom to just end a book series the way DC/Marvel can cancel a book if it isn't making money. Nor can they cross over characters as easily. For me, comics aren't really about the individual characters, so much as the universe they all exist in. And, because publishers probably aren't willing to give writers that much freedom, I don't see superhero novels gaining that much success. You've got DCU, but you don't see S&SU.