That's the only solution I can think of other than an outright ban. It could also coincide with the last gasps of the gasoline tax.

It might still not be enough, however, and it would be highly regressive without some sort of heavy scaling based on income: The disparity between the value that people at different income levels place on their time is staggering. That disparity is the entire reason Uber (and the rest of the service industry) are thriving.