The FAA has begun to remove half of the VORs in the NAS USA. Eventually VORs will be backups to GNSS RNAV.
http://www.flyingmag.com/news/faa-begins-vor-decommissioning-program?cmpid=enews120115
Interestingly coincidentally Australia has started decommissioning 181 navaids across the country. (VOR’s and NDB’s).