Sounds to me like Jerry Jones is just blowing his mouth off, as usual. He knows the NFL will never do away with the cap, but he'd love to make a stink about it in the media for his own personal agenda...jmo.
They wont play without a cap, they just have to renew or redo the current CBA which would expire before 2011. He said "if" it wasnt renewed or redone, but if thats the case we should be more worried about having a 2011 season at all.