[danielki]

I wouldn't be surprised if Google acquired Uber or Lyft within the next few years. The massive amount of data one of those companies can provide would beneficial enough to Google to justify the purchase - mapping data for Google maps, traffic data for Google Now/Maps, detailed driving data for the self-driving car project, information about where specific users go (targeted ads, Now, etc), and more.

Additionally, Google's self-driving car technology that it's developing would be best-suited to something like Uber or Lyft. The self-driving car is (at least at first) much better for an on-demand usage model, rather than an ownership model.