There are guys that get written off without ever playing in a regular season game. Everybody doesn't deserve more chances, and I feel fine writing him off.
He hasn't been compelling in my opinion. There are only 3 QB's n the team, so we have to make do with what's here, but I'm just not any more excited about him than I would be if Paxton Lynch, or Drew Stanton, or Chad Henne, or some other faceless backup were suddenly signed by the Bills (in fact, even less so). Rosters throughout the league have guys just as compelling, that will NEVER start. They are called JAG's.