For NFTs the real challenges realted to data are it Storage, Retrieval and Security. There is no copyright protection mechanism on the interent as well as the decentralized storage solutions are pure storage with no query capability. All these things need to be addressed sooner so that we dont see any issue with NFTs.
Well all these things cant be addressed at the same time. There are modern database engines that have best query mechanism but I am not sure whether they fit best in blockchain.