I think if you're really looking for permanence, the best bet is to make lots of copies using diverse storage systems -- including Filecoin, IPFS' own incentivi

I think if you're really looking for permanence, the best bet is to make lots of copies using diverse storage systems -- including Filecoin, IPFS' own incentivized storage system, ArWeave, etc -- and then use a content-addressable protocol like IPFS as the front end to access them. That way, whatever system survives, you'll still be able to seamlessly locate and refer to your data. (Full disclosure, I work for the Filecoin Foundation for the Decentralized Web, which is certainly part of the wider IPFS Cinematic Universe.)