This is why the free market is so great. 1. Everything too expensive? Good, don't live here, eventually enough people will leave to drive all of the costs back to other market norms. 2. Dumb startups? Good, they will fail, people won't be able to afford to live here and they'll leave. 3. People are spoiled? Uber is cheaper and more convenient in some cases than taking the local transportation. When people stop taking…
Disclaimer: I don't live in SF and never would > When people stop taking public transportation because it's fundamentally broken (ps - it's awful in SF) then it will force government organizations to re-think their planning. I think what is much more likely is that the government will simply raise taxes to cover the shortfall and let the public transit die.
That kind of happened in other parts of the world (in the former socialist block). You know what happened afterwards? The significant demand for mass transportation encouraged private parties to step in. They weren't as good or as convenient compared to the former government-subsidized public one, but they solved the problem for a while.