Immunity is not likely to happen, as it would amount to granting redistribution rights to anyone who downloads a piece of content. So the political solution is out. Anonymity is a requirement.
That's not to say IPFS is useless. It's just not going to "replace HTTP" or any significant part of the web as long as it's possible to see who's sharing what. Or if it does, the sharks will feed.
If you doubt me, see all verdicts for infringement when bitorrenting.
You have no guarantees that the content put up via IPFS is by the original copyright owner.
Thus immediately after you receive the infringing content over IPFS and start seeding it, you are infringing on the copyright owners rights. You have no recourse and no legal defenses to protect you.