As I said, I highly doubt that people will accept Metaverses at this stage.
It's way too early. The infrastructure around a lot of these metaverses are incomplete and game mechanics are too complex to understand properly.
Will you bother to learn so much about a metaverse just to bet $5? Or would you just put $5 on roulette on Roobet...
The same thing was once said about computers, the Internet, and e-commerce. But today these technologies are no surprise, because we use them every day. Metaverse will not be limited to one thing as for example gambling but will give users a wide range of entertainment and leisure. Take a look at how many users congregate in The Sandbox every day and you'll see the future. Rumor has it that Mark Zuckerberg is developing his own metaverse. I don't think he's going to invest his money in unpromising projects.