The question is whether anyone cares about the scarcity. I think the more complicated the item, the less it makes sense perhaps. The more utility in the item, the less I care about a separate ID number associated to it, I would think. For example, let’s move away from pictures momentarily and instead think of lossless music files. You consume music more “actively” than an image, and a literally identical music file seems weirder to pay more for. Or perhaps a movie. “An original pressing” NFT movie that has the same content as the $5 version. To some extent it feels that the Napster revolution proved the opposite: people are willing to take a hit on quality for price, and I would have hoped once upon a time that the response would have been to go more physical. People like plastic, so include trinkets you can do things with when you sell a digital thing because the trinkets can’t be downloaded (until we figure out crazy 3D printing of arbitrary materials I guess).

In some respects, blockchain currencies make the most sense precisely because they aren’t bound to some fictionally scarce “physical analogue” to remind you that it’s just a number. The currency says “the number has value, that is the one axiom you must believe”. An NFT muddies this by saying “the number has value BECAUSE it is tied to this unique thing that actually isn’t unique.”

Edit: One added point: if the scarcity is “real” due to some outside constraint (a card that can be used in a game, and thus it’s not yet copyable asset that people are buying but the unique ability to use it), then the above does not apply and NFTs seem like a fine way to standardize a cheating proof way of handling this.