Simple to answer, in your purely hypothetical scenario:
What are existing car parks going to be used for? Without car ownership, why the need to know which cab is theirs? what is stopping the first person from jumping into the nearest cab? Without car ownership, ride sharing can also work much better, there is no longer a single person being responsible for return trip. Thus won't be 100 cars waiting.
Only $11bn into both hybrid and electric vehicles?
VW investing $84bn into electric vehicles alone.
https://www.zmescience.com/science/vw-electric-vehicles/
How much range will your hybrid engine car give us? The future is tiny motorbike engine range extender in an EV for those people who must produce tail pipe emissions. The 2040 ban is rumoured to require 50 miles zero emission range, unless you put a battery size of almost whole gen1 Leaf EV in there, you'd be hard pushed to achieve that range by engineering a traditional hybrid.
(8.6kWh in the Golf GTE to achieve 25 miles of EV range, 19kWh is likely required to achieve 50 miles of EV range. In comparison, Hyundai Ioniq battery EV 30kWh can achieve 100+ miles of range)
Speaking of tail pipe emissions. I was in the city (of London) with my wife and 6mo son to apply visa for the little one. My wife hasn't gone into the city best part of this year due to the newborn. She had only been going to local parks, supermarkets and shopping centres. Walking from Regent's Park to King's Cross, She kept saying how bad the air is, and how smelly the main roads are. The diesel taxies and idling "hybrid" buses are to blame. The electric cab future mentioned above is part the solution, with new range extender equipped electric London taxi filling the gap now.
We really need to change the way we live right
now, $11bn is a drop in the ocean for one of US biggest car company, only doing development on a mild hybrid that we have already seen 20 years ago is waaaaay too late. (similarly, VW's 48v mild hybrid engines are pretty pointless IMO, PHEV should be absolute minimal right now with range extended EV coming in 2025)
They have opened up their order books to whoever want to order their single trim level Model 3. A lot of the pre-orders are people waiting for the cheaper, shorter range version. I don't really see Tesla having problems getting sales. Demand for Model 3 faaaar out strip supply. Thanks for supercharger network, Tesla is still the only viable long distance EV, the Model 3 is the cheapest ticket into that charging network.