That's silly. RSVM has nothing to do with the FMS. Every day
thousands of people and millions of boxes fly all over the world in
jets with just two vors and an ILS.

The G1000 includes a flight director and (unlike the Avidyne) can show
attitude information on any of the displays. It has all the same
capablities as other FMS systems. The only it is missing is an
integrated autopilot, but that's coming real soon now.