I doubt they would do this (or if they did it would't be well received). For better or worse Peter Parker is the Spider-Man. People read the comics for Peter just as much as they do for the titular hero. Miles is a great character and I expect to see more of him in the future, but if Marvel's recent slump in sales have proven anything, it's that replacing the classic heroes with the newbies instead of having them work side by side doesn't work. Can't really see this trend changing even after the MCU trilogy.