While that statement may be true, its significance isn't as much as one may think. Remember the Blackberry? They owned the smartphone market - back when the market was extremely tiny and was primarily comprised of business executives. What made smartphones go mainstream? The iPhone.
The same may be true for VR headsets. Is the Oculus the most popular VR headset? I'll take your word that it is. However, I only know a handful of people who have a VR headset at all, and they're all über geeks. Like the Blackberry, the market is comprised of a non-representative sample of the population. Should VR headsets go mainstream it probably won't be the Oculus doing it - otherwise it probably already would have.
Will Metaverse make VR mainstream? I doubt it. The public doesn't simply trust Facebook enough for that and the public hasn't been very receptive to VR. I don't see the metaverse going anywhere.