Yes, I even remember everybody saying that tablets will never be used because of the gorilla arm (?) effect, that you can't hold your hand long time up. But now I see a young generation using exclusively tablets. Also the first iPhone, was looked at strangely. I remember being ashamed of using one. Internet was slow. We will know only in hindsight. I have no idea about the future of VR. I see the use-cases, but let's see.
Same story for the iPod, same story for the MacBook Air, same story for the iPhone.
I think we'll see the same story play out once there are a few "killer" apps for it, and some of the features are refined (pass through sharpness, for example), and it gets a bit cheaper.
Gen 2 was so perfect that they sold it for years and years, and launched a related product line based on its platform (the Mini).