This is a good idea, but I'm afraid it's rather unworkable in practice. If you're going to remove a page, you either didn't want it up, or you moved it somewher

This is a good idea, but I'm afraid it's rather unworkable in practice. If you're going to remove a page, you either didn't want it up, or you moved it somewhere else, or your entire site is unavailable. If you moved it somewhere else, you should add a 301, but for all other cases it's not for lack of will that the link died. The nice thing about IPFS is that it has this out of the box. Pages can never die as long as at least one node has them in their cache, even if the original owner went away.