At least, Metaverse can offer a new experience using VR equipment that some gamers already use to play many games. The cost will adjust from time to time and with the newest technology, everything will be updated following the current situation. The gambling industry will change when VR equipment can be applied, which may also change the interface of the gambling industry. The smart contract will solve the problem of the fee of the transaction and with so many options now, people can choose what they want to pay for the services.
It's not really new per se, it's just an old experience at the comforts of your home via the use of new tech. Honestly, any industry would have the chance to change if VR was implemented, after all, if they were able to merge the implementation of VR tech and make improvements with user experience via that, then user experience with VR would tremendously improve, probably defeating what real-world casinos could bring out (temporarily that is, till tech could do it in the real world as well).
The development of technology affects areas of our lives in different ways. Some areas are completely changing and some are only introducing innovations. Gambling has existed for a long time and is very well entrenched in many countries, so completely displace them online is not possible. When the Internet will be available to everyone on earth and will cost less than a deck of playing cards only then the number of real casinos may significantly decrease.The meta universe will be visited by people with above average income as AR/VR equipment is still very expensive. So don't expect a drastic change in the gambling industry.