I am also concerned about it. I dont think XIV is going to die out or suffer soon (I believe Yoshi P when he says there are currently no plans to implement them)

What I worry about most is some kind of Square NFT service where purchases of NFTs get tied to non-nft goods. Tying emotes or glams to ownership of NFT's confirmed by some sort of proprietary marketplace. That way they'd not have to implement them directly into XIV but the game would still suffer as a result. Like some sort of dystopian virtual amiibo.