Uber already has a few competitors; traditional taxis, limo services, blackcarssf.com, Lyft and Sidecar come to mind. > people tend to overestimate the amount

Uber already has a few competitors; traditional taxis, limo services, blackcarssf.com, Lyft and Sidecar come to mind. > people tend to overestimate the amount of jobs available (or rather, the variety of the skillsets these drivers might have). If this is true, it's a good example of supply and demand telling these drivers that they need new skills. It certainly will be more true in the future when self-driving cars become the norm.