It is true that the content associated with NFTs is typically stored on centralized servers the properties of the NFT itself are stored on the blockchain.
Some platforms are exploring decentralized storage options where the content associated with NFTs is stored on a distributed network of computers. These decentralized storage solutions aim to provide greater security and permanence for NFTs.
But these Bitcoin and others Altcoins or NFTs are working because of Technology. If Technology is here so they are working. If there will be WW3 so after that the Technology will go down. So we can't say anything. How much the will live.