I dont think the NFL is so short sighted that they would pass up a QB because he wasnt white. The NFL and its teams are all about winning. Winning = $$$$$$. If a non white QB can help them win and make money you can bet they are going to take him.
With that said Im of the mind that this is just another witch hunt. Certain groups have to find a reason for their groups failings or lack of success. Usually that results in finger pointing and playing the race card instead of looking within to determine why they dont qualify or arent good enough. The latter is hard to do. Playing the blame game is the easy way out.