You seem to take it for granted that electric vehicles will reduce the resale value of ICE cars to a significant extent. Yet while this is likely I don't see it as guaranteed right now. While there is a well developed support system with reasonably predictable cost of ownership for a used ICE car (that's what I wanted to point out), it seems to me still not clear if buying an electric car beyond a certain age makes any sense at all, if a single defect to a key component makes the car a complete economic loss.
I believe that much will depend on environmental legislation, e.g. the attempts to ban ICE cars from city centres.