Agree, but we're going to disagree on the solution. For example, I'm ready as a citizen voter activist to demand a combustion ban phase out schedule.

https://en.wikipedia.org/wiki/Phase-out_of_fossil_fuel_vehic... (Jurisdictions with planned fossil-fuel vehicle bans)

You could probably just let the states decide. CA and some east coast states will immediately do just what you're suggesting and/or as the technology becomes better and more mature more states will do the same or it will just organically happen because EVs are likely to reach a point where they're are the obvious choice for a larger and larger share of users and you won't need to ban anything.

This is true, and the most likely outcome considering federal gridlock. The boondocks will be the last to come along, and its going to be relatively straightforward to get enough states in a coalition to force automakers towards EVs.

https://www.commondreams.org/news/2018/05/01/states-represen... (States Representing 44% of US Population Sue Trump's EPA for Blocking Auto Emissions Standards)