As with film cameras, internal combustion cars have a long logistical tail that is highly dependent on the continued existence of the current volume of use. So

As with film cameras, internal combustion cars have a long logistical tail that is highly dependent on the continued existence of the current volume of use. So when electric cars start squeezing them out, gas stations and repair garages will start to disappear, prices will go up for fuel and parts. Poor people with junker gasoline cars they really don't want to replace will be driving longer to find fuel and sooner or later will be driven to either convert their car or sell it for scrap. The only demographic that will be able to afford to run them will be moneyed enthusiasts. Once they effectively disappear from the roads (and the voting booth) the government will ban them. I expect that taxis and trucks will be mandated self-driving before cars will, because the safety upside will be obvious and huge, and the government is used to meddling in those industries. Seeing the results of that, there will be a sustained public pressure to mandate it for cars, with each accident splashed on the news and reporters saying "if only". As above, they'll first become rare and then banned.