That I can agree with. I am not sure how much of a case he would have, since he has other options to play football (CFL, UFL, etc.). The NFL is not the only option.
While the NFL may be the biggest and best, the commissioner is the ultimate determiner of who gets to play. The owners hired him to do that very job. If an owner or two disagrees with the commissioner, that is their choice. Regardless, the Commissioner is there as long as the owners allow him to be there and if he says that Vick cannot play, Vick does not have much standing legally. Of course, I am not a lawyer, but I would have trouble seeing how the NFL would lose a case like that. Nobody is saying Vick cannot get a job. That does not mean that Vick has a right to whatever job he wants.