I just feel that this is the PC running amok, as it is always OK to have peter replaced as Spidey, have wally replaced, have thor rerplaced, Steve replaced as cap etc, but just imagine having as you state BP become white, or Luje Cage becoming white or latino!
just have more characters if you want to have more minorities, but so not replace the characters that have been well established in their roles for that!
There was a half-jewish, half wakandan Black Panther: Kasper Cole. That was a great story and much was made, in story, about why a white guy was dressed up like a black kitty cat.
Luke Cage's daughter, Danielle Cage, is not only a legacy of Luke Cage (and not 100% black)...but she eventually becomes Captain America in the future.