All of these directly effect the unit economics of ride sharing.
All of these directly effect the unit economics of ride sharing.
So if the market price for taxi service in a city is X, already accounting for all those factors, Uber/Lyft should be able to deliver the same or better service for (say) 0.9X, again accounting for the factors but adding in efficiency gains from bypassing parasitical taxi medallion owners, not needing dedicated vehicles, having much easier ordering, etc. There will be some variance in how big that factor is (eg. NYC's $1 million medallions gave Uber a really juicy margin to exploit), but overall, if a city can sustain taxi service, it should be able to sustain Uber/Lyft too.
So if a city wants to kill Uber/Lyft, all they need to do is to attack the rideshare margins directly. (Not that they really should. Uber/Lyft is probably a civic good.)