The problem is the writing. Writers in the Golden Age, and Stan Lee in the Golden and, more so, Silver, Age, were literate and well versed in mythology, history, literature, philosophy and the craft of storytelling. That's the reason their characters had staying power, and that's the reason the stories they wrote keep getting re-told. The problem is most --most, not all-- modern comic writers are none of those things, and like Hollywood, don't understand that it wasn't the size of the explosions that made those original stories so memorable.
So will there be great superheroes again? Only when we start valuing liberal arts educations again.
So will there be great superheroes again? Only when we start valuing liberal arts educations again.