Gas-Powered Awesome
Elio Addict
Did you miss the part of my post about the extremely rare, proprietary Buick computer system that can still be readily repaired today? That's 3/5 of the way to your 50 year mark...I can fix 50 year old cars and get them running again because they are comparatively simple. How easy will it be 50 years from now to get today's cars running? How easy will it be to find all the electronic components for that car, 50 years from now?
As always, it will be the mechanical systems that will need most of the work.
Electronics, especially integrated circuits (computers) tend to work indefinitely. No moving parts. I have a 35 year old computer, my first, bought in 1979 that still works just fine today.
I also have a 65 year old television that still works fine. Remember the TV Lucille Ball had in I Love Lucy? Yep, that one. Needed all the capacitors replaced, but those will always be available.
The fact is any car, truck, tractor, motorcycle, or other mobile contraption that has an enthusiast community will be repairable nearly indefinitely.