I think bans are a pretty terrible idea. It implies that the alternatives aren't good enough. But due to the bans people will be forced to use them anyway.

It's great if you're an EV manufacturer though because you can rack up your price and customers won't have much of an alternative. Bonus points if the government also bans imports of EVs from certain other countries.

Even if this isn't the objective, it nevertheless is a way people will see the whole situation as.