Now let me explain why.
I love the Flash. Do you know what Flash I grew up reading? Wally West. Barry Allen died in 1985's 'Crisis', and the role of Flash was taken over by Wally. I started reading comics regularly in the late 90s. From that point on until 2007, Wally West was the Flash. Over 20 years. Who is Flash today? Barry Allen.
I learned a lesson in 2007 about Legacy heroes: They are nothing more than fill ins and also rans. The hero most identified with the role will ALWAYS come back and be the default hero. Even after 20 years Wally West wasn't the 'real' Flash, and DC had to bring him back, Connor Hawke eventually made way for Ollie Queen's return as Green Arrow. Kyle Rayner plays second (or third) fiddle to Hal Jordan once again. Bucky eventually turned the reigns of Captain America back to Steve Rogers ... and if you think Steve Rogers won't take it back once again from Sam Wilson, you're deluding yourself. These changes don't stick. They never do. They never have. The one that stuck the longest was Wally West as Flash. It lasted over 20 years before that carpet was pulled out from under us. Do not get attached to Jane as Thor. Don't get attached to Miles as Spider-Man. They are second stringers. I learned this the hard way when DC swiped Wally away from us. Now every time I see someone patting Marvel on the back for their diversity, I laugh.
People are praising them for having a black Captain America and a female Thor and a biracial Spider-Man. But it's really a joke, because Marvel will change them all back eventually. Steve Rogers will be Cap again. Peter will be Spider-Man, and Thor will be Thor. Because Legacy heroes don't last. They never do. They are also rans. If you really want diversity in comics, create NEW characters. So long as Miles Morales and Jane Foster stand in Peter Parker and Thor's respective shadows, they can't shine. Someone is always standing there waiting to take their identity back, just like Barry did to Wally.