I think it would be great to have a team experiment with the QB position. The position is so important to the team that it is probably the most critical position in any sport. So much responsibility is given to the quarterback that few players can play it well. And when some team tries to have a running quarterback or something, they get hurt easily. Having a team experiment with distributing the role among several quarterbacks and distribute the responsibilities might be good for the game.
It sounds interesting, but I'm not sure how it would work. I guess if you had a mix of QBs with different strengths (e.g. one that is better at throwing long, one that is better with quick-release short passes, and one that was better scrambling/running and evading the blitz) it would give you options. The problem I see is that having specialty QBs might tip off the defending team what you were going to do. You bring in a guy who can throw long - you're probably going to go long. You bring in a guy who can run with the ball, maybe you're going to run. I guess you could use the move to decoy the defense into thinking you were going to pass - but then run - etc.
They have tried this with the Wildcat Offense to some extent. We are even seeing the option come back to the NFL. Tebow would work good in both of these offense packages.