You are right. The incentive structure is not there for them to coordinate. At least not yet. I see a coordination layer but not what we saw in the Reddit style sites. If you request an uber from your agent, you agent will need a place (like a relay) to post that you are looking for an Uber driver, my agent, knows I want to drive people around, will pick it up and coordinate/negotiate a price and the. Both can shake hands. Then it will send both of us notifications, ETA, etc. I personally think this is a very close future.