Depends on the definition of "what is an RPG"? Personally I consider there to be many styles of RPG - with some gradation - and I do think VR can fit into some subsets of them, though I don't think VR will be any good for gaming in general for a very long time still. Some RPGs have a very great degree of abstraction, which does not in this case mean a loss of detail, but rather something like deciding that your character shoots an enemy - that's abstracted, in that you're not in first person aiming and firing but rather, selecting an enemy and choosing a "shoot" action, and (when you've attended to other matters) clicking End Turn. There are other RPGs where you actually do aim and fire, so your personal skill with a mouse affects the outcome. EYE: Divine Cybermancy is an example of this, although EYE still brings character skill into it with things like damage boosts based on Accuracy skill, or reduced recoil, or skill requirements for some weapons. Certainly EYE is a high quality RPG even if it is not the more traditional, abstracted, PnP-inspired type, and you could theoretically have a VR-based RPG that follows a similar model.
If I were speculating on other ways that a game would combine the player having some "player skill" involvement while still having "character skill" being relevant, if you had a VR RPG which had a magic system in the style of Arx Fatalis - drawing runes and aiming your spells would be done via VR controls and based on player skill, while character skill would affect things like how many spells you can cast, how powerful they are, etc - and other traditional gameplay elements like exploration and acquisition (finding and collecting the runes before you can actually cast them) would also be relevant. That's one way in which you could have an RPG using a VR system.
But for a traditional turn-based RPG viewed from a distant camera, I don't think VR really has a place. And I think that even if VR headsets become extremely high quality, extremely lightweight, with extremely good controls, the traditional monitor, keyboard, and mouse setup will remain the optimal choice for most video games.