Autonomous cars don't have to be electric cars and electric cars don't have to be autonomous. These are two different things. An autonomous non-ev car will blast out more heat than a non-autonomous ev.
Strictly speaking not. But ice cars are a lot more complex. And they are more expensive to operate. So, I doubt there will ever be a large market, or even any market, for autonomous ice vehicles.
I could travel coast-to-coast in a weekend in an autonomous ICE vehicle (35-45 hours on the road, depending on traffic), but likely not in an autonomous EV.