This will never happen on any mass scale. Once cars get to about 10-15 years (depending on climate) it is not longer economically sensible to do certain repairs

This will never happen on any mass scale. Once cars get to about 10-15 years (depending on climate) it is not longer economically sensible to do certain repairs, eg engine swap. With EV conversions, it's the same - a lot of money creating a very subpar product - low range, low safety, unbalanced weight distribution, bolted on controls - all to keep a rusted frame and deteriorating upholstery going for a few more years. EV conversions are a great idea for collectible cars / hobby cars. Classic VW Bug, Fiat 500s, etc.