>car makers are incentivised to try to ensure their vehicles have decent resale value

Why? They are only incentivised to make more profit, and selling high-tech expensive cars that break after 10 years is great for that. The ones that will bear the cost of that will be either the financing companies (and it would be fun to see the market collapse as the current crop of shiny German cars hits the 2nd hand market and no-one is dumb enough to buy one), or those poor souls who insist on buying old-ish cars instead of leasing like everyone else.