There'd be a double image download for content fetched from IPFS, increasing latency. Essentially the server wouldn't have to store any old content that hasn't been accessed for a while. Would probably make operational costs a lot lower in the long term, at the cost of user experience for old and unpopular content. Not bad?
Yeah, could use the distributed block FS as a sort of cold store, but at the same time the local node would always have the currently most popular blocks.
Relying on a distributed system that has a lot of churn in members for content availability is a bit of a gamble though, and content that doesn't get requested very often could just disappear if there's no systematic "clones" being done. Probably a shit idea, honestly 😅 I'll stick to posting pictures of pretty girls