I'm concerned about hoping "millions" of Metaverse devs will use Verse when, right now, the biggest problems with Metaverse are more about frameworks/netcode than the underlying language.
An open framework for handling interpolation, client & server space simulation (w/ physics), forecasting/prediction for events, and handling at least 30 ticks/s for a connection target with <150ms latency, <10% packet loss, while being able to handle thousands of connections + tens of thousands of entities PER instance (and also seamlessly mirror data across instances to enable large maps without zoning): that's a huge need for large-scale MMORPG-style Metaverse design.
I'm not at all certain we need a new language to do that.
I know it's hard to compare the usage percentage of various programming paradigms because many languages are multi-paradigm, but FP represents a much smaller piece of the pie (especially in games/networking) and, honestly, we have several generations of existing engineers who don't do FP.
Still, it's nice to see that Sweeney hasn't given up on making FP more useful to the mainstream! =)