Most of the self driving cars should be fleet, so I doubt any of these specifically will occur. It will be more like having cheap reliable taxis around, and anyone who has lived in a cheaper country (like China) might understand that.

Coupled with electrification going on at the same time (many countries and states have set 2030 or 2035 deadlines), the CO2 impact won't be as bad, although we should still focus on public mass transit.