The mention of vintage pieces is very à propos. Manufactures, at least most of them, cannot provide original parts. And you are the one who has to hunt them on the different collectors markets. True.
For DB and some other original Indies, I doubt we'll have the available pieces, in let's say 30 years, if DB disappears.
Some silicon parts, or special or very technical parts, not so sure they will still be available.
Best,
Nicolas.