Here is the most probable scenario by 2025:
2022 : electric self-driving on-demand FLEET car 1000 miles/month subscription for $350/months from Google, Uber, Lyft
2025: same car 1000 miles/month subscription for $250/month. Individual car ownership will reduce by at least 35% from 2018 ownership levels in developed countries.
by 2023, Google will supply Self-driving OS software to all FLEETs (except China Didi which develops it's own) and discontinue their own fleet running business.
GM, Toyota, VW, Renault forced to run own FLEETS to stay in business like Uber, DiDi