such a contract is a possibility, but why would big owners give an exclusive right to such pools? It seems to me it'd make sense to offer those for any miner as long as the get paid a little for it. Especially when it's as simple as offering an incomplete transaction with the appropriate SIGHASH flags.
a part of the reason I like this idea is because it will allow stakeholders a degree of influence on how large the fees are. At least from the surface, it looks like incentives are pretty well matched. They have an incentive to not let the fees drop too low so the network continues to be usable and they also have an incentive to not raise them too high because it'll push users into using other systems. Also, there'll be competition between stakeholders, which should keep the fees reasonable.
I think this would at least be preferable to the "let the miner decide" model.