Defensive coordinators around the league will dig out last years Oregan/Stanford game. Stanford was the only team to stop that freight train from Eugene. Defenses will get better at stopping it, but I don' think it's a fad. I think there will me more and more athletic QB's who can throw coming out of college. So it will remain part of the game. You will just see teams moving in and out of the zone read. Once QB's become veterans and their mobility starts decreasing, they will move to more conventional offenses. That's what the Redskins will have to do when RGIII returns.