I'm not sure how to put it, in the grand scheme of things EV for the US market is going to be small eventually, in the long run the biggest incentives of EV come from nations with 1) no oil production, 2) pollution issue, 3) moderately urbanized (not too rural where range is an issue, not too urbanized where car is a burden).
China and Europe would likely consume up to 2/3 or more of most EV produced, and US would likely be way less, in families with more than 1 vehicle. Gasoline would still be around, but a lot of daily commutes would be done with EVs. Will we in the US ban gasoline? Probably never, because we have a lot of oil and we love suburb living with some rural life mixed in. The rest of the world would likely also never completely ban gasoline but only in "some" area (like we won't allow people riding a horse on the freeway and need permission to enter downtown with a horse).
If you think mandating EV / hybrid in certain areas is hard, imagine "fixing infrastructure" so we won't need a car for everything. Other than urbanization and discouraging suburb, it would likely not happen in the next 50 years. People love suburb housing with a yard and drive everywhere if they can afford to, the problem really isn't the cost of gas but more of traffic jam and EV isn't really going to change that too much.
Electrical grid problem will likely go away with time of use pricing (going to happen eventually after smart meter is popularized) and large enough battery capacity (so you can hold more than 1 day worth of commute and charge based on pricing). IMO the only way to fix a duck curve is big enough of a residential storage that "has to happen anyways". Inverter + battery for home solar is a waste due to round trip loss, but if you have EV that you need to charge anyways, it becomes a lot less wasteful. If you have DIY swappable battery you can plug into a wall socket while you drive, then you are going to be able to take advantage of every single hour, even during day time when you are driving your car. I really think this would be the eventual solution to duck curve, range, and battery cost (a major part is labor cost to build and swap the pack if it dies on the car).