non-fungible tokens can't act as a currency at scale. NFT is a niche on its own that will prove valuable in all sorts of areas, but it will still have the character of a collectible or an equity title or something similar. Currency needs to be fungible in order for it to work at scale.
They may not be currency of its own but they can certainly create a demand and that is all that matters, it is not about being a currency or not, its about being profitable and as long as its profitable then its good as coins. Remember you can sell them for crypto as well so that means there are things where you can invest with crypto, just like how you invest your fiat into crypto, you can invest your crypto into NFT instead of keeping it for crypto at all times. What we need to focus on here is that if NFT will have the desired impact or not, and I feel like with these gaming stuff we will eventually see one company, probably some gaming company that had a founder or owner that likes crypto personally, will end up making such a game that it is going to change the world of NFT, we will see a whole game world that runs around the NFT and crypto idea and will make it insane.