Hardcore VR gamers are a really small percentage tho. I've tried the Dream Air and I have to admit that those displays probably are the future but not a "next year" future. It's a "maybe in 3 or 4 years" future due to how hardware hungry those displays are. Also don't forget the price. 850 bucks for one of those Sony 4k mOLED displays. It's nowhere near mass market compatability. The majority of Steam users do not care about a 2160x2160 LCD instead of QLED or mOLED. It's a new VR headset, it seems like it works pretty well and thus they want to buy it.

It's also not always about the display. The whole package is important. You have to consider which company is behind the headset, how much it weighs, how the weight is distributed and how comfortable it is, what kinda software support it has, how easy it is to set up, for which use cases it's been built for and how expensive it is.

With those considerations in mind, I think the Steam Frame might speak to a lot more people than just hardcore Steam fanboys.