NFTs for expensive art is not something that fits very well longterm.
But NFTs for simple trading games where assets are tracked by the trading game company as well as the blockchain (e.g., affordable cryptokitties) is much more reasonable.
But, then it just becomes part of the games industry. And those games simply utilize the blockchain.
NFTs are only as valuable as the extent to which the artist has gone to socially validate your purchase of the NFT of their artwork. Which means that it's value is also directly tied to the total social value of the artist themselves. Thus, Beeple.
The NFT market will eventually reach a steady-state no different than the existing art world. But, smaller and more affordable NFT "trading games" (e.g., cryptokitties) might stick around for sometime.
But NFTs for simple trading games where assets are tracked by the trading game company as well as the blockchain (e.g., affordable cryptokitties) is much more reasonable.
But, then it just becomes part of the games industry. And those games simply utilize the blockchain.