I mean laws will ban the sale of new ICE cars, which by then will be the "old tech".
So when you can't even buy one new, why would someone want a used one? (unless, like I said, it's a pleasure driver or some exotic, which is a tiny fraction of all cars sold)
Think of all the things that have been replaced and superseded in history - once the new thing exists, the old one drops in price dramatically.
I think you underestimate the financial burden of buying a car. As long as a gas vehicle runs, they'll be a market for it. If they depreciate even faster, they'll still be a market. People don't care about resale at the bottom of the market. They care about reliable transportation which I assume gas cars will continue to provide.
There are plenty of 20 year old vehicles out there with plenty of life left in them.
> So when you can't even buy one new, why would someone want a used one?
If people would want to buy them before considering availability of new ones, banning new one increases market clearing price of used ones by eliminating an obvious alternative.
Now, as the number on the road dwindles, you'll start to see reduced support infrastructure (gas stations, parts availability, etc.) which will make ownership less attractive, but that's likely to be a slow and lagging process. So, if there are still utility advantages to gas cars, I'd expect used ones to become more expensive initially with a ban on new ones, but drop sometime later.
> So when you can't even buy one new, why would someone want a used one?
Because the prices of non-collectable ICE cars is bound to plummet unless we haven't solved the battery charge speed issue (as in, in practice, supposedly it was recently solved in theory).
So when you can't even buy one new, why would someone want a used one? (unless, like I said, it's a pleasure driver or some exotic, which is a tiny fraction of all cars sold)
Think of all the things that have been replaced and superseded in history - once the new thing exists, the old one drops in price dramatically.