The average /lifespan/ of a car in the UK appears to be 13 years which I think means we currently expect half of cars to be used for longer than that. EV batteries apparently have 7-8 year warranties, I assume that's the result of a lot of careful consideration.

We can expect battery tech to improve in the next 8 years, and hopefully become cheaper, but a move to EVs could still drastically limit availability of cheap vehicles for those who need them.