I get what you're saying, but I think it could work, even with some tweaks to fall more in line with everything. Peter is thrilled, Miles is not. Ganke could still be there.
But there seems to be a lot of people crying out for Miles to be in the MCU and not bother with Peter at all. People want the representation of a more varied cast in the MCU. This would be a way to bring in Miles sooner and not anger the Peter fans.
Peter still works works better as a distant foil to Miles, rather than growing up as friends. Miles' experience as Spider-man is completely different from Peter's, and his coming into being Spider-man is a rough journey that's finally acknowledged when he gets Parker's web-shooters holds such a significant meaning because he's a complete outsider.
He has to own up to the fact that there is no Spider-man because of him, and figure out how to do everything all on his own, and eventually directly introduce himself to Aunt May (& others) as a total stranger who feels solely responsible for Peter's death. Having a preexisting relationship with Peter dampens a lot of what makes his journey into being Spider-man feel as meaningful as it does.
The Peter fans have had 5 films already and he'd still be the Spider-man in Civil War & he'd be around initially in the Spider-man film if they spin it right out of the "Death of Spider-man" arc like I've been chatting about, and I think that that's fine for the Peter Parker fans to get on board, and get introduced to Miles to let him take up the mantle going forward.
I mean to be honest, outside of the comics the mainstream public doesn't really know who Miles is.
The same could've been said of Nick Fury, Maria Hill, Ironman, Hawkeye, Black Widow, every member of the Guardians of the Galaxy, or any number of Marvel characters before they were brought out into the spotlight that is the MCU, though. That's all the more reason to make Miles the Spider-man of the MCU and
not Peter Parker.
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