Originally Posted by
datlas
I highly doubt that 10 speed will become obsolete any time soon. Maybe in a few years you may have to use eBay for parts, much as current 9 speed users are likely doing now.
You can run a 10 speed cassette on 11 speed wheels, you need a spacer which likely comes with the wheels or can be had quite cheaply, so fear not.
I find 9 speed shifters, cassettes and derailleurs brand new on amazon and through vendors from my LBS.
Shimano still manufactures 7 speed cassettes, haven't been able to find new 7 speed shifters.
10 speeds will be around for a long time.