I can see a lot more older pins getting broken in the next for years tbh.
Doubt it. Pins have always been broken, either because they are just totally knackered or to keep higher end games going with expensive boards (NBA for WPC 95, Sharkey's for Whitestar etc) but the market would really have to nosedive for this to increase in my view, which I consider pretty unlikely.
Also as @DRD says the older generation of games aren't really worth that much in parts anyway, and if cosmetically ok then Pascal/Alltek etc can often resurrect non workers.