Forget about the digital artwork non-sense. People will lose interest in that sooner or later.

Imagine you guys are gamers. You play a blockchain-based game that supports NFTs where you create your own characters. Those characters need to be trained to acquire skills. Fighting skills, armory, speed, etc., etc. Let's compare this character evolution in the game to activity points on Bitcointalk. It takes time and hard work to build-up your account/character. With traditional games, you never become the real owner of that character you spent time creating. You can't transfer them between games. If your hard drive fails, your data is lost, and your game progress and characters are lost as well. When the game developer released a 2nd edition of the game, you have to start from 0 again. But if you could make it your own NFT, it's yours. Now imagine if you could import/export these characters and use them in different games. There is your use case, and that creates a market and demand. I am not a gamer, it doesn't affect me personally, but I understand how this would appeal to those who are.