I'm not as sour on Lynch's off-field transgressions as most. But I think what needs to be stated here is the fact that he's just not that good. I don't think he's really needed at this point. Not exceptionally fast/strong/intelligent (football-wise) and not the receiving threat he was made out to be when he was drafted. He's not a burner, not a bruiser, he's just kind of there, and that's it.
Fred Jackson ran behind the same line Lynch did with much more success. Perhaps that is more of a sign on how good Jackson is than an indictment on Lynch, but at the end of the day, I don't think the Bills lose a whole lot if they unload him.