For an Uber-X driver, you could find your coverage cancelled if you are carrying passengers for hire. Moreover, if there is an accident, you could be sued personally, as well as the Uber-X company, who provides a paltry $1M liability policy (no word on collision). So if you have any assets, they might be forfeited, if you are sued as the result of a ride-share gone horribly wrong.
From a legal perspective, they are operating an unlicensed cab service, plain and simple. You can all it e-this or cyber-that, but the bottom line is they are acting as a dispatcher for a fleet of unlicensed and unregulated gypsy cabs.
By the time they get this all sorted out, we'll all be driving Google Driverless Cars anyway, right? ;)