I will be surprised and disappointed if McCoy is starting next year. He is clearly used up at this point, and the lack of a good running game has increased the pressure significantly on Josh Allen. Put Todd Gurley type stud RB ( not easy to get) in the backfield and add one very good WR, and Allen will quickly become a better version of Jared Goff.
If McCoy is the starting RB, that means the Bills likely have the worst running attack in the NFL. Not great for developing the a young QB