But worst case, it may be this generation’s WebVan.
I think there's a similar problem here in developed countries, too. All of the people I know who use or talk about Uber who aren't tech-crazy twentysomethings use Uber for two primary purposes: as a ride to the airport, and as a designated driver. These are, generally, situations where people will be less cost-averse: after buying a plane ticket or a night's worth of drinks, the cost of "an Uber" seems small.
In addition, the struggle to move past the idea of "Uber = drunk taxi" will certainly be a difficult one. The only people who seem to think Uber or Lyft will replace car ownership either are people who live in a big city where they weren't going to own one anyway, or are people who have invested in Uber or Lyft. I think I'm still stuck in snark mode here: if Uber or Lyft want to replace taxis that's ok, but all these grandiose plans of doing any more than that seem dead.