He might be a starting QB next year but only because the NFL is starved for starting caliber QB's and dumb NFL GM's and coaches can be easily duped by a few good workouts. Cutler needs to retire. He has become fragile, is a turnover machine and lacks leadership. Tyrod by far a better option if they can keep him, get him some healthy WR talent and consistently good O-line play. If the Bills let Tyrod go and Cutler is also out there as a FA, Tyrod will get far more interest.
Heck Fitz is a better option than Cutler.