Doesn't really matter if you know it's a run when there are just as many people blocking that there are trying to make the tackle and that's where the issue is..It's a creative scheme but it won't work forever..
It'll "work" forever because there's nothing fundamentally wrong with it. It's just not reasonable to expect it to generate constant big plays once the novelty wears off. Then you have to decide whether the practice time to effectively install it in the offense is worth the practice time you force opposing defenses to take up to defend it.
Be interesting to see what the Eagles do with Vick in it though. Not going to lie, seeing how much they have the formation in their offense, I'm kinda of excited to see what Vick can do with 10-15 snaps of it in a game.