In economics and particularly in industrial organization, market power is the ability of a firm to profitably raise the market price of a good or service over marginal cost. In perfectly competitive markets, market participants have no market power.
I'm pretty sure I don't have the exact facts on what Uber's operating agreement with drivers is, but I always thought a given driver could choose to only drive during surge pricing, no? We always tried to manage our drivers for an elastic supply of capacity (much like an ad exchange). Otherwise, we'd be overwhelmed like the under-covered transport problem in Austin during SXSW (I believe a result of the lack of Uber availability). Uber's radio adverts explicitly state that it's "drive when you want for extra money," and if that is not what they actually offer then Lyft has a huge opportunity to acquire/retain more/better drivers and maintain a rapid ability to scale for capacity.
I am of the belief that Uber presents a unique opportunity to rethink the whole structure of unions in the US (I don't actually care if Canada bans Uber altogether, for example, I am more interested in the concepts themselves), and maybe a total rethink about how to organize labor.
I would have interest in building a commercial platform to help labor organize and coordinate themselves better (that they own) in the modern world. I think it would look like a gated digital community with microblogging, discussion, and voting functions.