If 10% of new cars being ICE isn’t enough to keep most gas stations in business then any number less than 10% would also cause most gas stations to fail. In the early days people where willing to be inconvenienced because ICE where such a step up. But, if the alternative is drive 20 minutes each way to a gas station or charge up an your parking space it’s just not going to be worth it to drive ICE.

>it’s just not going to be worth it to drive ICE.

You seem to be mixing market forces with government mandate here a bit. Why not still allow 1% ICE and see how the market reacts? Maybe you're right and it would result in near-0 but why enforce 0 ICE?

It’s just a question of efficiency. The first day sales of new ICE are outlawed there are going to be a large number of ICE cars already on the road which keeps most gas stations in business the next day. In effect the difference between 0% ICE or 10% ice is only visible several years in the future.

It’s simply bad policy to create a situation where a lot of 5-15 year old cars get scrapped because nobody can find a gas station. The country is much better off when people scrapping cars because they can’t get gas are doing that to 20+ year old cars.