While it is a great sounding idea, there are a few potential problems I see. First problem is that there are probably several teams who are not all on the same page. For instance, I could see the Flyers or the Leafs or the Red Wings agreeing to a luxury tax type system. However, I could see teams like the Bruins or the Blackhawks pushing for a salary cap. The problem is that because the owners are behind Bettman and because of the gag order Bettman has imposed (and don't kid yourself, if Bobby Clarke or Glen Sather could speak about what's going on, they would), we never get to really hear what the owners or GMs have to say.
The second problem is that it is the GMs who have to work with the new CBA. You'd figure that the GMs would be asked for some kind of input in the negotiations. Not once have you seen anything like that? Why not? Simple, because they could find a system that would be beneficial to all. Not once have you seen any of the GMs asked to be part of the negotiation process.
The third problem has to do with Bettman himself. You can bet that if the Players Union were to present an offer, there is no way in hell Bettman would let the proposal get to the owners. Unfortunately, this CBA thing has come down to a battle of Bettman and Goodenow waiting on who blinks first.