Metaverses are actively developing becomes better and interact with each other.
That is why I think that Metaverse is not a bubble. It is a new technology that is actively developing and becoming better.
Now appear projects that allow interacting different Metaverses. Here you can read more about this https://www.livebitcoinnews.com/lbank-exchange-will-list-shuna-inuverse-shunav2-on-january-5-2022/
If Metaverses will be really useful for people the demand in them will continue to grow.
Now many new Metaverses appear and people have a big choice what Metaverse to use.
Many big companies create their own Metaverses. The demand in Metaverses continues to be very high.
Facebook creates its own Metaverse. So Metaverses are not a buble.