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It seems to me that it's probably a situation similar to the "Ghost Fleet" where there is no real expectation that it can be brought back into service without a fairly significant refit.

I'm not a chemist, but from what I recall natural rubber is subject to (relatively) rapid corrosion by ozone and synthetic rubbers don't have this problem. The rubber used for tires on planes and cars is synthetic.

I don't feel like doing the research right now but obviously 'rubber' is an umbrella term if natural and synthetic rubbers have different properties.

I believe that with synthetic rubbers, it is less of a problem. This was exactly where I got my experience with; old car and motorcycle tires, particularly tires that had been left out in a baking junkyard for a few years.

The dashboard of my 240Z agrees.