Meta wouldn’t have to spend billions jump starting something if it was a commercial success. No commercial success in history needed tens of billions for commercial success. It either sells or it doesn’t.
You obviously mean "there's no field fulfilling criteria X that I haven't spelled out".
VR predates Meta's acquisition and took far less than "tens of billions" to get to commercial readiness. Several small-ish companies have got products to market. Heck, even Google's half-hearted attempts resulted in a fairly decent 6DOF headset.
VR in its currently incarnation will not make a system that will sell 100 million units, which is the regular size market of the leading home console in a generation (both switch and PS4 sold this much).
I’m surprised they sold as much as they did tbh.