I think people are fixated on the situation in their own geographical niches.

I've never had a problem getting any of my cameras CLA'd or repaired (even fairly recently). Usually it was more a matter of which repairperson to choose.

The fact is that mechanical cameras rarely need spare parts, other than the odd piece of foam or spring, which are no problem at all to adapt to different models.
It's electronic cameras with their proprietary modules which are 100% dependent on original spare parts.

Again, some of these postings bringing up all these terrible "problems" older cameras have don't fit with my own real life experience at all.
YMMV...