I would say that VR, Holo, and AR are certain to be big and have mainstay value for years or decades. VR is obviously ahead at the moment in terms of domain sales, maybe simply due to the fact that a number of VR headsets are already on the market. Even with VR most of the sales reported thus far have still been resellers as far as we know.
I see Holo as having massive potential. You would have to clutch at the HoloLens trademark issue not to accept this, but as discussed above, there is no possible trademark issue occuring with the Holo word itself.
AR is likely to be huge as well as we've seen with the Pokeman. Also the HoloLens and such like are still being described in much of the media (not by Microsoft but by the majority of journalists) as AR rather than mixed reality. But it could go the other way and even genuine AR could end up described as MR (or something else). So the future value of AR and MR isn't quite so certain in my opinion.
And maybe all these technologies will be given a broad name which might just be VR, Holo, Virtual, even virtuality or anyone of dozens of other candidates.
I can see in a few years all headsets being capable of vr or mr. You will likely be able to simply gesture control the level of background from real to 100% immersive just like turning down the brightness of a tv set. And when you can move around in VR (I mean physically in the real word as with the HTC Vive) most intelligent VR will incorporate some real world meshing even if only to avoid the wearer crashing in to things :
