Electric/hydrogen vehicles aren’t really zero emission. Their emissions are at easier to control, generally more efficient facilities that are going to get “greener” in the future.
Generally speaking, electric cars are powered by variable power because they aren’t base load- meaning they run on whatever the most expensive source currently online is. Most or all household loads are the same way with possible exceptions for refridgeration and HVAC.
I also think this could be dangerous without SERIOUS upgrades to our current electric grid. The loads we reguarly put on it now compared to where it should be is startling. If we are going to sell cars, might as well have electric be a standard option, but I’d rather spend more money in cross country trains and state/ local public transport