if the goal is to use a language for a metaverse, with lots of actors, why not use Erlang which is great for dealing with multiple actors, plus it already exists? I don't use it because I don't need it for my usual programming, but once you get some of its quirks (coming from a functional world they're even less), it's a great language.

It seems to me that the objective is not finding a good language for a metaverse, but using the idea of a metaverse to justify this new language.

More realistically, an open metaverse (if it will see existence, I'm not yet convinced of its utility) will support multiple languages.

Even more realistically, the internet is a metaverse already.