I'll try my best, again - my knowledge is nowhere near perfect so any blockchain experts please feel free to jump in.
Uber aggregates data. When Uber pairs a driver and a passenger, the company serves as an enforcer. Uber must verify the ride went well and once the transaction is complete, Uber sends money from the passenger to the driver (while keeping some themselves).
Our argument for Tesla would likely be that Tesla will soon be able to do the same thing without a driver, and therefore undercut and ultimately defeat Uber.
In this scenario Tesla doesn't actually change much in the relationship between driver and passenger. Tesla would still be a middleman, albeit a less expensive middleman than Uber.
With Blockchain, theoretically drivers would be able to connect directly with passengers as the blockchain is a P2P system. There would be no need for middlemen. This would be similar to how bitcoin transactions don't require a bank...just one party transacting directly with another.
Because this Tesla Network model is built on the idea of capturing revenue as a middleman, I'm concerned that P2P transactions won't need a middleman to enforce contracts and that Tesla will be left without a sustainable model.
Thoughts?
P.S. This is a good primer article on the concern I have for those interested:
http://www.nasdaq.com/article/move-...ble-real-sustainable-sharing-economy-cm716709