Lots of new battery technologies are coming out at the moment. Also, if the market only has EV's, there is more competition, and it will reduce prices.

I really look forward to being able to sit in a traffic jam without any petrol fumes. The cost of improvement to people's health should also be fairly decent

Subsidize them or don't tax them as much. Norwegians do not have much issue affording them compared to ICE vehicles.