Just reading back though the specification of IPFS, be wary about the claims of 'permanent Web'.

Distributed content in IPFS is eventually purged from nodes unless one of the hosting nodes has pinned it to be retained. Therefore, if no-one at Time x views certain content and pins it, then unfortunately at Time x + n that content might disappear just as thoroughly as under HTTP.

Unfortunately I fear that means that 'popular' content persists whilst niche and unique data might still fade away.