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Let's take Axie Infinity as an example. Many people, even not crypto-oriented or familiar with anything about crypto try to enter game and forced themselves to learn because of the play-to-earn- feature.
The NFTs are attracting new users to the cryptocurrency market and if you are a group mod it is a really hard time to make them understand how to purchase and safe guard them. It is a hell of a job to even make them understand because they have no idea about the market. When it comes to gaming yes there are many who are avid gamer's who will try their luck in this market.
The same will goes on Metaverse-based games that involve gambling features. Even a gambler is not familiar or having difficulty understanding the stuff about metaverse or NFTs, as long as they see more opportunities to earn here while doing gambling, they will do anything to learn it.
And no. It won't be a threat in the future for usual gambling because features are different.
It is not going to be a threat as the user demography is a bit different, who likes to collect art and does other gambling is different.