Dear The Authority,
Didn't you get the memo? Miles Morales is going to fail because he already has. According to some, he doesn't even deserve the opportunity to succeed in another medium, such as movies, because his titles don't sell enough (like ASM's Peter Parker version). Therefore, he should be banished from comic books forever (I might be reading previous comments incorrectly, but there's enough negativity in them for me to jump to this conclusion).
Essentially, it seems as if Miles Morales is not worthy to carry on the Spider-Man legacy if Peter Parker was to "retire" or be "killed off". There is only one Spider-Man and his name is Peter Parker!
To which I say (as a white dude whether that matters or not) - bullsh!t. Miles Morales is an interesting character with a ton of potential to become something other than a minority super hero. If done correctly, he can become to us what Peter Parker has: A hero.