I'm not sure where you got that we need 1B of such vehicles. We won't. But of all the vehicles that will remain, I'm willing to bet that almost all will be EVs.

I'm not sure where you got that we need 1B of such vehicles. We won't. But of all the vehicles that will remain, I'm willing to bet that almost all will be EVs. Even if there will be a fraction of vehicles on the roads compared to today, they still won't be using ICEs. Hence, mass adoption of EVs is inevitable either way.