My experience as a potential buyer has been that my agent is there to let me into a house and then do the paperwork if I decide to write an offer. This not to say that he is incompetent, on the contrary he is a very knowledgeable and professional guy to work with. But I would think that increasingly, many people no longer rely on an agent to get the scoop on a neighbourhood or the general market etc. So it does kind of make the buyers agent somewhat redundant.
On the other hand, since purchasing/selling a house is going to be the most expensive transaction for most people , I do not think we are going to see a pure peer to peer market either.