Agreed many NFT's have little long-term value, but they do have a good side. Many talented artists (some of whom would have no other way to sell their products) have found happy customers for their creative work. I hope the SEC doesn't try to claim all NFT's are securities, that would be way too Draconian, imo.
Recently, SEC is on the neck of almost every sector of cryptocurrency and it seems SEC is loosing recently the legal way. I don't think that SEC will claim that all NFTs are securities. If anybody needs to come into NFT for regulations it should be the body of Arts and not SEC.
NFTs have lived longer than I expected them to and it seems it is not leaving the market any moment unless there is a bigger pressure from SEC.