I'm comparing them as modes of transportation. Obviously different propulsion methods. Cars replaced horses. A day, year, decade, doesn't matter, they replaced horses for transportation.
We aren't replacing cars, just changing the way they are powered. Like trains, ic vehicles won't disappear, they will continue to operate until it's too expensive to operate (gasoline becomes too costly, parts availability, etc). It took twenty years or so before most steam engines met their demise, often working local routes and relegated to yard duty for the smaller engines. So I don't think it will be an overnight type of transition, but I think it will be hastened by those who stand to profit from the EV market.