I don’t know when Miles’ era will be over but I don’t think it’s going to end sometime soon, since Miles just barely started his own adventure. We’re definitely going to see Miles grows up. I mean I’d be furious if not! Hmmmmmm if you get this idea because of my comment in my latest art post, oh my god I’m so sorry! I was referring to the current limited series ‘Spider-Men’ where the 616universe, grown up Peter Parker accidentally thrown to ultimate universe (Miles’ universe, in which this universe’s Peter had died). It’s going to be released into 5 separate floppies, 3 has been published so far, the 4th is scheduled on 8/8/12. And eventually they’re going to compile it into one neat HC or TPB.
So, the current ongoing spider-man series are: The Amazing Spider-Man, Avenging Spider-Man (these are in the 616 universe a.k.a marvel’s main universe, the Spider-Man is Peter Parker), Ultimate Comics: Spider-Man (the one with Miles Morales), and the last is limited series Spider-Men (the one with 616 Peter Parker and Miles Morales).
I hope this clears up the confusion!