Superheros cannot create lasting change because they are creatures of repeated, regular fiction, and because their setting is almost never allowed to deviate too far from “the real world, except with some superpowered lunatics running around”.
Sure, one story or another may attempt to show this happening, but once that creative team leaves and the Corporation hires someone else to take over, 90% of everything that went before gets thrown out and things are reset. Year-long cataclysmic crossover that destroyed six hundred and sixty two universes? Awesome! It sure was cool when Mister Fister punched the space-time continuum, wasn’t it? But now the new guys want to do a low-power comedy version, so Mister Fister’s back to being a lowly waiter at a Vegas casino who beats up criminals on the side, just like he was back in 1934 when “Pony” Stephens drew his first year of eight-page stories for one of the companies the Corporation now owns.
