Any half thought idea will likely fail (save perhaps windows ) However if you can hold on to that original buzz feeling you got when you first invisioned it and capture the idea in it's whole with words alone, you'll get that idea out there the way you see it. Think about why you originally believed it could work and try to put it into words. That's the art of it.
Oh, and it's a great idea, I can see why you'd be excited by it at first thought because you're thinking of similar games (hockey games with entire seasons and upgradeable players for example) and seeing how it could influence this area. The idea is a good start, but there's more needed to convince others. Remember, you see the whole thing in an instant, it's your thought. BUT. Others need a little more convincing, that's all.