Based on
this post on Bill's Blog about reusing components from the new control system, it appears that there are plans to reuse the cRIO and some other components from year to year. I remember seeing somewhere later about a plan for every other year to get a new cRIO, but that may have been someone's idea and not an official announcement.
That being said, there have been the DS issues this year that are getting teams a new DS for next season. What effect this will have on the rest of the system being used remains to be seen...