Personally I'd be all for a weekly progression system. Or a confidence rating (a purely performance based rating) that adjusts weekly. High confidence gives players slight bonuses, low confidence has the reverse effect. You see it in the NFL when a player has a good week, he gets a confidence boost and he can build on it. It works the other way too, when a QB comes out and has a bad game, often it can become a slump and they have to fight really hard to get out of it or even they get pulled.
I am expecting a major overhaul of the current progression for Madden 11 though. Josh said they simply made this years progression playable, and are looking to implement a better progression system in the future. I'm hoping that means in the next dev cycle...