I feel like there will continue to be motivation for some company somewhere to keep making parts and components like freewheels and rim brake calipers etc for a long time. My concern is, will it be "nice stuff"? In the case of something like 9-speed cassettes (not really C&V), I'm not sure. Right now, Shimano and SRAM both offer XT-level versions, and for that I am happy. I also need to do some stocking up.