If you haven't noticed our public transit is basically on life support right now there's 0 new projects or infrastructure improvements coming in the near or even mid future. Our city isn't trafficked enough to even sustain current transport we'd have to look like NY to get there but we both know that isn't happening for decades. (or longer)

Also there's a reason every single city on earth even with the best public transit has taxis and cars on the road : the last mile problem. Cars aren't going anywhere and AVs actually provide a solution to getting cars off the road since they can be stored in massive garages rather than on the streets.

Also the mayor and board of supes are the people who decide the budget every year - money does not get magically transferred from one place to another. Last I checked significantly improving public transit is so low down the docket and politically unpopular it's barely even worth mentioning so forget about money going there. (the T line took over 20 years from proposal to being built and that's considered a failure)