What failed to take off specifically (and what I imagine the poster was referring to) is VirtualLink: https://en.wikipedia.org/wiki/VirtualLink

This is the standard that was implemented into cards for a couple years in the hopes it would result in headsets that connected to a computer with single cable. Compatible headsets never materialized so the port disappeared

PCVR is still very expensive to get into, and last I checked the most popular HMD on SteamVR was still the original Vive.

And we also only have a few high budget/tier games that are made for VR (arguably, only HL Alyx)

The Quest isn't really relevant here, and it's also extremely heavily subsidized.

It is by no means mainstream.

Must have last checked a while ago, because the Vive is #4 these days at 7.3%; 47% of the headsets used with SteamVR are Quest 2, with the original Quest making up another 3.8%.

The Vive wireless adapter costs as much as the Quest 2. So for anyone wanting to cut the cord, it was a no brainer.

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