See

http://www.usatoday.com/travel/fligh...rol28_ST_N.htm

I assume by "commercial" airspace they mean areas like Class A-B or A-C.

And by "GPS" they appear to mean not just GPS but ADS-B.

The article doesn't say which private aircraft will be expected to install
this equipment, but the deadline is 2020.

I hope the government will not use this as an excuse to decommission VORs.
VORs are the only back-up for a satellite system that is easily jammed or
spoofed (unless you have an INS, but there aren't too many small single-engine
aircraft so equipped).