Sales… to know if it is a fad or not — we don’t know, at least not yet. Actual numbers of people that use it more than once and put it in a closet? Let’s see.
Steam stats are based on active users iirc - at the moment about 1.93% of all Steam users use VR Headsets, and Half Life Alyx recorded 42k concurrent users. This is keeping in mind Q2 (the current sales winner) is a standalone headset by default. You could argue most of those concurrent users used the headset once and put it away, but that line is getting harder to argue as time goes on and the numbers keep increasing.
If this was 2016-2019 I'd agree it was very touch and go in terms of where it was going. But the investment and interest building around VR now has that here-to-stay feel to it - at least on my sometimes accurate vibe-ometer.