> kindly, what would make you believe that the private, highly-likely-to-ignore-or-skirt-regulation ride sharing industry would produce a mass-transit product that remains price/service-competitive in an american city?

Your question very unkindly builds in a biased premise, namely that "highly-likely-to-ignore-or-skirt-regulation". Also, ride sharing killed taxis by essentially working around a ridiculous pile of regulations, and good thing too, and we should all be thankful for that. So right off the bat your reply is phony. You were not being kind.

But I'll answer it anyways: I gave you an existence proof that such a product can exist. Buenos Aires is even an American city in a way :) Sure, it's not proof that such a thing can work here, but then too no U.S. city has tried to put together a public-private public transportation partnership like Buenos Aires', so in fact we can't know until we try, but your attitude is one of the reasons we can't even try.