I think it's important to point out though the number of cities where biking is impractical (and can even be unsafe). In many parts of Europe, this is probably a good model. In San Francisco, this could work. In Seattle, where now live, I've seen an uptick in rented bikes (though plenty of regular bikers too) -- but it really depends on what type of commute you're making. In New York, it depends on area -- but if you're really concerned about time/money you'll take the subway. But in Atlanta or Los Angeles, this isn't going to be a solution for most people that use Uber now.