> the younger generations are less likely to own cars. Public infrastructure is never going to fill the gap except in certain urban areas.

And Uber/Lyft work reliably only in urban areas. "Younger generations" will inevitably grow older and may want to move out of tiny, expensive city apartments to larger accomodations outside the city. Guess what. Public infrastructure fills the gap much better than Uber/LyfBolt do (at least in Europe).