All of the NFTs you know and love today, have their data stored their on centralized servers (images, video, etc). What is only stored on the Blockchain is just the properties of the NFT itself. While you're basically the "owner" of the NFT, you could lose technically lose it if the centralized server hosting the content of the NFT goes down.
So, what's the point of investing in NFTs if they can disappear in an instant? Unless all of the content is stored on the Blockchain itself, I don't see how NFTs will be able to last forever.
Above all of this, I believe that NFT's are worthless. I didn't think they were "worthless" until recently, I believed they were worth "less" than what they were sold for, and it wasn't just this bear period that made them go down but they would stay down and it wasn't a good position to be in if you were an NFT owner and even bull wouldn't bring them back to ATH prices again.
However, recently I changed my mind and started to think that it is worthless and will be terrible as well. I believe that we shouldn't really focus on them anymore and I suggest everyone to stay away from them and never one any. Only do so if you think you are not doing it as investment, if you really want to support the artist then that's fine, but never for investment reasons.