Miller winning the Heisman would be awesome, but since he still has 2 more years in the program it's not as big of a deal right now. I could easily see him finishing 2nd or 3rd behind Geno Smith and some other player, but I don't think he's going to have the passing stats to win it.
Obviously he's also on pace to run for 1,600 yards, but I think that in this day and age people are going to favor passing yardage more than anything when it comes to QB play. Playing Purdue, PSU, and Illinois will help, but even against Indiana he didn't throw much more than 200 yards.
Doesn't really matter. If he can stay healthy, beat Mchgn and still put up 3,700+ total yards, I won't mind if he doesn't win the Heisman. He'll get plenty of recognition and be a favorite for next year.