I wonder what the response would be if they included Luke Cage in Daredevil and he was played by a white actor?
But this isn't the same. Miles is a new character. It's not like they just randomly made Peter Parker black, I agree that would've been dumb.
This isn't like making Luke Cage white, it's like introducing a new Power Man who's not Luke Cage who happens to be white. Which I actually think they did a while ago, and no one complained.
I'm not a fan of Miles either, don't particularly care for the character, but your comparison was really off.