very good question, although Doug is cutting the tax used for roads I am sure the roads will still be fixed by the tax payer
I would think in a future with mostly electric cars you will have some sort of mileage charge, the more you drive the more you pay which is very similar to today.
Even with fairly high Hydro costs, charging a car is pretty cheap..
12$ for a full charge getting 400km
the whole idea of GAS gone as a commodity is bazaar it would affect the entire global economy.
best question