> the choice here may be between buying a new electric and a used combustion that costs 1/4 of the price
This is why targeting new car sales, instead of fleet composition, is the best strategy. Despite the latter being the closer input to emissions.
ICE vehicles at and above EVs, in price and capability, should not have a market. Those EVs should then have the opportunity to decrease in price through both economies of scale and learning curves, on one hand, and the emergence of used vehicles, on the other hand.
you joke now (because oil is dirt dirt cheap right now) but just wait a few decades. I've listened to some of the most knowledgable people in the oil industry (Art Berman and others on Nate Hagens podcast) discuss Oil. And it looks like Hubbard's curve at least on a worldwide basis is true and oil supply is only going to go down in the long term. The peak is much much closer than most people expect. The world is so much more dependent on oil than it realizes and the impacts will be far more profound than most economists currently realize.
It's probably worth noting why cars are finally scrapped. It's usually not because of problems with the engine, but other issues that EVs also have. Rust (in Northern Europe this is a big thing), crash damage, generate state of disrepair. Of course EVs will remove some issues meaning the lifetime of cars may extend a little, but it's not going to increase it significantly.
By the very nature of lithium batteries EVs are basically throwaway cars after 10 years.
The cost of replacing an old battery pack quickly exceeds the value of the car. You might be able to get a few extra years refurbishing it but that’ll be expensive and require niche battery work that’ll be hard to find.
The oldest Teslas sold are now about 10 years old, and this epidemic of no-longer-holding-charge cars heading to battery replacement or scrapyards you speak of hasn't happened yet. From most accounts I've seen, the cars have 80-90% of their original capacity at 150-200k miles.
One of the big takeways from Art berman, Nate Hagens and other experts on this subject is that the growth of GDP is very heavily dependent on Oil and it's impossible to decouple that within the next several decades. That may sound unlikely but the evidence they've shown is overwhelmingly convincing. One of the things I've learned is that reknewables aren't actually reknewable: they are mostly all tied to oil in some way, almost everything is because everything is either made of oil or uses oil in it's production, hence it's "the hemoglobin of the economy".
So there will always be more demand. It's the mainstream media that has it backwards: they're the ones always saying peak demand and that's misleading.
But the choice here may be between buying a new electric and a used combustion that costs 1/4 of the price.
Or between buying a new electric and keeping the existing car longer.
Pretty sure that over the next 10 years at least, the latter two are the cheaper options.