I think if the internet and the way we connect becomes something grander than it's current incarnation, accessed and experienced through a different form than the current traditional domain name system, I can see the "meta" keyword trend continuing to sell as do domains with "internet" in them; although reported sales are still common, but not once have I ever visited or used a site with that keyword.
The initial rewards on these meta keyword domains will be because of the frenzy, but eventually people will still be meta, without having to break-up wording or specify it within the domain. Much the same as it is today, short, descriptive domains, minus the "meta" or the "internet".
If the metaverse becomes a new internet, a different internet, for me looking towards domains that will embrace and use that space is probably the better long-term investing solution.