But that's my point. It is still a good indication of what a modern FPS is, and of what HL3 would be. I don't see them changing the game radically to be a "native" VR title, which is what VR needs (and which may not even be what we call a FPS anymore).
I agree, if HL3 is going to be one of the killer apps for VR then it will be radically different. I think Valve have the resources to pull it off, and I suppose we'll see what path they take.