Way too soon to give up on him. For one unless he is due some ridiculous roster bonus that we are not aware of the bulk of the rookie deal money has already been paid to him. He is a cheap roster spot now. As pointed out a beefier front 7, perhaps learning from a true pass rusher like Merriman, and just experience will help.
He still looks like a huge bust but Tamba Hali looked like a bust for KC and he has very good last year. If he, Moats, and Merriman can give the Bills a decent pass rush it would be huge for the 2012 draft.