Obsolete is an interesting idea, I take it to mean parts no longer available. Given sufficient donor camera bodies and repair expertise that problem isn't insurmountable and one can think of popular classic cars where every component is now available again due to demand.
It's not hard to imagine 35mm classic camera being worth enough money in 20 years for enterprising individuals to re-make the bits that wear out.
I think Sover Wong does this for some small parts of the F2. It should be perfectly feasible to make just about any part for the cameras of that era, if costly. It's just engineering and there are no electronics to worry about.