So, a lot of the questions about "dynamic content on ipfs" seem to boil down to how to aggregate content from multiple sources. Use cases:

• forums (also see zeronet)
• distributed search engine (Search engine ipfs-inactive/archives#8)
• wikis
• a single dataset partitioned across multiple nodes, with each node only having permission to push updates to their own section
• other stuff, probably...

This should be possible with IPFS+IPNS, but it needs to be well-documented and streamlined for users.

Another issue is how to make it scale, so you're not having to aggregate millions of sources in every client (e.g. reddit on ipfs).