Obama is cool like that.
DC could probably get away with it for lesser other characters outside of the Trinity (it would probably piss a lot of people off if they kept relaunching Batman, Superman and Wonder Woman with a new #1 every 2 years). DC has also been expanding their Digital First comics and I don't think it would be a bad idea to have characters like Amethyst have digital series.
Plus Marvel uses DC as a testing ground in a way (and vise-versa). Black Cat was definitely created to combat Cat-Woman (who had recently gotten her solo back), and Captain Marvel to combat Wonder Woman (ironically the character Carol Danvers was sort-of created to be the Wonder Woman for Marvel back in the 70's, in the sense that she was supposed to be a feminist icon. But it didn't go so well.)
But, DC doesn't seem to interested in copying Marvel lately.
Yeah, Marvel is a quite lacking when it comes to female villains. Most of their female villains become heroes (Black Widow, Scarlett Witch, Emma Frost), and since the X-Men (who had a bulk of the villainesses) have pardoned all of their villains, Marvel is really lacking on that front. DC also knows they lead in terms of iconic villains and uses that to their advantage. They literally had that
Year of the Villain event not too long ago.
Hmmm, it really only seemed to help Wally West. I think, as someone put it, "Marvel is big on
legacy heroes, DC is big on
side-kicks." And those sidekicks usually go on to become their own heroes under different code names.
DC did just do
Future State, with some legacy characters, similar to what Marvel did in the 90's with the 2099 timeline. The only character that seems to have stuck was Yara Flor, who will be released in a
Wonder Girl ongoing this year.