Majority of the time a car is not driving. At any point in time, only 10℅ of cars are on the road. For an average car that is 20k$, that is a big waste of investment for everybody in terms of resources and time.

Car sharing is a temporary fix. The real fix is when cars can be brought to your doorstep without a driver. And you can just ride off.

But the more cool and more disruptive thought is when the car take you anywhere you want to go. Lots of transportation modes might become obsolete then.