I can think of two parties that have their own answers:
1) A certain group of people who like computers and grew up reading sci-fi think it would be cool; some even tell themselves it's very important, but for vague reasons that they can't really articulate
2) Centers of capital are interested in it as yet another platform for consumption, attention-capturing, and rent-seeking
I think Zuckerberg is both. But I'm not convinced that society at large has any real motivation to buy into something like this, unless the sheer novelty ends up being powerful enough to rope people in.
Note that a world without a "metaverse" still has a place for VR/AR. Having a complete, interconnected virtual world is not a prerequisite for all the utilities and entertainment that that hardware technology can be used for. And to me it just feels like an incredibly unnecessary layer on top, which serves no real purpose to anyone outside of those first two groups.