Hmm ipfs has many issues for solving that problem, and the whole filecoin nonsense adds an additional layer of problems.
And web decentralization is not going to have any real impact unless there is a standard set of technologies that can be the basis for all the main use-cases, and that the average, computer-illiterate user can adopt by clicking a link or two, or better yet comes built into their browser. IPFS is much further along here than anyone else, so it seems like the Solid people should be looking at integrating with it, if that is technologically possible.