I would argue that Epic / Fortnite has a leg up on the metaverse than facebook. They are already doing virtual-esque events like that concert and it's only a matter of time before they add the VR/AR aspects.
Tim wouldn't sell. There are higher chances that Epic will be bought by Microsoft or by Sony PlayStation division. Or... they will go the Valve way, by creating their own platforms on open source, see Steam Community, OS, Deck, Index, etc. Many don't know but Steam Workshop and Community are extremely active, many social/creative things are going on across many gaming communities.