SW, the only big challenge I can think of at the moment is how are you going to enforce the rules?
From my experiences in scenarios, where the CM's have absolute authority, there are still people trying to find the loopholes and circumvent the rules. Imagine what it would be like in the MA!
Don't get me wrong, I like your idea, but it assumes that everyone would gladly abide by the rules. I just can't see that happening.