It is not a dream, it will happen. Don't believe me, believe in billions of $ pouring into EV plants by Ford, Merc etc after seeing it is possible following Tesla'a example. ICE vehicles will always have niche place obviously.
You don't need to wall off anyone. There are ample solutions. If you reside or work in metropolitan areas you have to pay a tax to own/use an ICE. What is impossible with this? By the way, even without taxes, people will see the advantages of EVs. They are cheaper to operate and if Tesla keeps delivering with its promise I think this Model 3 can be another Iphone moment. Taxes/benefits are just to encourage people's faster adoption for health/environment benefits.
Anyhow, we will live and see. I just wished people wont have these attachment to ICE cars. I fail to understand, even as a jet fighter fan, the allure of owning V8 cars as a daily commuting option. Burning oil should end for commuting.