Sounds like you’re depending on some form of loyalty from the gaming company, which I think is naive.
But power creep management will exist to the extent that gaming companies make an active attempt to control, just like any other game. Magic The Gathering might be a good template for how companies could (but won't necessarily) handle it.
Magic The Gathering is almost 30 years old at this point, has released over 140 sets over that 30 years, and has developed techniques to manage power creep pretty well (maybe not perfectly, I don't really pay attention to MTG much anymore, but they clearly think about it, as they have articles they've written about it[1]).
You can pretty much consider each type of card in MTG as an NFT. Certain tournaments allow certain cards or don't if it turns out they're too powerful, or only allow the most recent sets where they've balanced things better, or whatever.
Different types of games allow different types of things. Some games or game modes might let anything go, whatever you've got, bring it, no matter how broken it is, while more tournament like games or game modes might limit what's included to more tightly control it.
Kind of like what I heard in Halo Infinity, where professional players think the Mangler gun is too powerful and want it nerfed, while casual players are having fun with it and asking the devs not to nerf it, or at least not in more casual modes.[1]
It's not like these solutions don't exist elsewhere, it's just up to the developer how they're going to incorporate it. Will some players hate that X NFT gets banned in Y game mode for Z game, and will it devalue it some? Oh I'm sure it will, just like I got annoyed that my Mind Twist card and a couple dozen other cards I had in Magic The Gathering got banned. But I still have it 20 years later, and I still throw it in to play with friends every once in a while.
[1]: https://magic.wizards.com/en/articles/archive/latest-develop...
[2]: https://kotaku.com/halo-infinite-players-to-343-ignore-the-p...
Yeah, nah, I'll stay on the fence until there is at least a strong proof of concept for this.