I doubt that casinos in the Metaverse will attract gamblers on an ongoing basis, the effect of novelty will pass very quickly, and I don't see any point in playing in the Metaverse. I think this is a mixture of pleasures. If I want an atmosphere of celebration and thrills, then I go to a real casino, if I want relaxed gambling, then I play on the computer, but I don’t know why I would go to play in the Metaverse.
We don't know until we try though, we may say that it's just a passing fad but when things get operational in the Metaverse, we might see something different. Only thing that I don't like about Metaverse is that it's owner is Meta which was formerly known as Facebook and we all know how censor heavy and how they meddled with politics in the recent years.