People pick the best option, while worse option can creep from being awful to just a close second, and then suddenly become the best option.
There's a critical point at which there's enough EV infrastructure to overcome objections, available cars become cheap enough, and then there's hardly any reason to pick gas cars that are slower, laggier, noisier, smelly, more expensive to run and can't be refuelled at home.
Even the type of person who buys a 3 year old car cannot (will not?) afford a payments on a new car accounting for the gas savings. They will buy what they can get - but they also will influence the market as they are likely to be sensible (often a new car is not sensible) and so willing to pay extra for the EV, and this in turn will put pressure on the new cars since trade in value is very important to most people who buy a new car (which is sensible, but it is the banks forcing this on the buyers)
Second order effects like load on an aging power grid could easily cause speed bumps.
I hope you’re right, but I don’t know I could bet on it