The change will come rapidly.
Most people are skeptical about EV adoption.
In 1960 if you told an average American, the thundering behemoth steam locomotives, impressive Big Boys and Pacifics , will be dead and gone, they would be skeptical. If you told them they will be gone in less than 10 years, they would be incredulous. But in fact steam locos peaked in 1957. The last batch of steam locos ordered by Pennsylvanian Railroad went straight from plant to scrap yard. The Railroad was so confident of the value of the steam locos they signed contracts with onerous cancellation clauses. The scrap value was more than what they could get back by cancelling the order. So that batch made exactly one run, from the pant to scrap yard.
It is the cost per mile that did it in. Total cost of steam locos, thermal efficiency of 6%, cost of handling coal, maintenance on these machines, ash removal, water replenishment... just too much. EVs are four times cheaper than ICEV, per mile. Sticker price is coming down. People will switch very quickly.
Gas will get very expensive, it needs very expensive infrastructure and the fixed costs spread over fewer gallons of gasoline will increase the price. Even if the crude oil is free, gasoline will sell for 2 $/gallon. That is twice the cost of EV.
The point is, gas cars and the gasoline infrastructure can disappear as quickly.