I've seen people making millions of dollars selling NFTs on popular blockchain platforms. Things that were thought to be worthless are now worth a ton of cash. While all of this sounds great, it's not easy to create a unique NFT that would gain demand on the market. High gas fees on the ETH blockchain, makes it unprofitable to sell NFTs on it. Binance Smart Chain would be a better choice, but mainstream adoption on the platform is still low these days (when compared against Ethereum).
Eventually all of this will go away. I know that it is a hot topic these days, it has been for a while and it is not a new thing, cryptokitties were sort of NFT (similar but a bit different) and got attention in its peak days, and now again in 2021 NFT got the same type of attention.
However at the end of the day we are talking about something that s not really that incredibly valuable, it is just a jpg that you own, you can't "own" them, it can still be shared, so you just own... the nft of it? Basically it is not really valuable, but even if it is for some people, it still should not be valuable as much as it is right now, we should not be looking to have coins that are millions of dollars, or pictures, or whatever they are, basically no NFT should be millions of dollars but for some reason they are. Which is why I believe we are not going to see it go on for very long.