I think you need to decide what you want an old camera for. If it is as a workhorse to take routine photos, because you like the feel of it or because the shutter is quiet (these points have been mentioned), then obviously it might need the CLA to do so but you really have to drop the idea that it is being saved for posterity.
OTOH if it
is to be saved for posterity, as an example of 1960's (say) tech and style, then it should be CLA's if possible and then used very little; such an "exhibition" camera needs to be at least
cosmetically in very good condition if not mint to start with however. Also there is no point in replacing any of its parts with 3-D printed ones - better to leave it with the original broken parts. Use a more modern and widely available camera for your daily worker, such as a K1000 if you are a traditionalist, otherwise a DSLR. You wouldn't use a Duesenberg Phaeton to drive to work, even if you might use an old VW Beetle.
Also, being CLA'd or tossed in the trash are not the only alternatives. It is still an example of the tech and style of the time even if it does not work and can be kept as such, in a glass case (metaphorically or literally). I went to the National Motor Museum at Beaulieu, UK, a couple of years ago, and I don't think that most people would expect all or even a minority of their cars to be runners, but none of them are heading for the scrap yard any time soon.
You also need to consier what will happen when you pass away
My kids I'm sure will just toss everything into a skip. You need to think about offloading any collectable stuff before this is likely to happen.