:WHAT!:@ the balded, why not just use you know... Peter Parker instead of completely re-writing another character
The characters are not clones of each other(when is a second version of a character ever?), Miles Morales is a spinoff character of Peter-Parker/Spider-Man the same way Robin is with Batman. You need one before the other.
Like I said in the previous post this is about payoff, the trademark Spider-Man that everyone knows wants to see is Peter Parker, the payoff is with the character crossing over and joining The Avengers down the line, it won't work with Miles Morales, Ben Reilly or Incarnation X, this isn't an unknown character, this is Marvel's top dog and the top superhero character in the world.
You think anyone wants to see Jean Paul Valley as Batman going up against The Joker in a movie and then leading The Justice League in another?