Not a lot of anything now days is durable like things used to be! I just don't believe in 40-50 years that there will be very many cars which are made today that will still be around to even restore unless they are stored inside during that time.
You’d be surprised. My SRT will be in better condition in 40 years than my ‘69 Dart was after 40 years. The modern cars are designed with 3x the service life that the old cars were.