Brad has stated once it makes sense to yes
https://www.pantheonmmo.com/content/forums/topic/1551/oculus-rift
Unity has VR support. https://unity3d.com/learn/tutorials/topics/virtual-reality/vr-overview
I've been playing around with an Occulus since the DK2 came out. Unity games do indeed tend to work well, even when forced. So at the very least, you'll be able to do it. Native support would be great though. UI elements tend to be a bit of a challenge without native support. Half-Life 2 (not Unity, obviously) for example, is incredible while Dreamfall Chapters, which is Unity, does not work so well. Dreamfall is dependent on mouse-over pop-ups for world interactions, and is in 3rd person, while HL2 is a FPS.
At any rate, I certainly wouldn't want to play an MMO in VR all the time, but for those exploration days where I just want to be immersed, it would be nice. At least give us enough UI customization built in to move, reposition, and resize everything and save profiles so that we can switch between them. With that, even if isn't natively supported, you could make it work.
Even if it is supported the question would more be is it reasonable to play it using VR? I for one tend to game for hours at a time. Doing so with a VR headset on would result in frequent headaches/migraines so I wouldn't be using it even if it was supported. At least not fully. Maybe once they work out the bugs and I see more things headed that way/cost drops I would think about it.
