I have not, though I am aware of it. Perhaps the planned white-space open licensing would give us the bandwidth to address this problem, and the performance of such decentralized systems could be improved. If such an improvement is possible, then something like mesh would have a good shot at market success.
In a given channel, 802.11 mesh networking provides roughly 1/7th the performance of non-mesh (and an ideal protocol only achieves 1/3) [1]; using more spectrum increases throughput but the waste is still there. Many people (especially telco lobbyists) would argue that spectrum shouldn't be wasted on such inefficient protocols.
