I would absolutely love an IPFS based version control system, something superficially (or more) resembling fossil would be amazing. I think it's probably one of the best applications for IPFS, since a lot of the core data structures and primatives required for version control are already a part of IPFS. A version control system built on top of a distributed content addressed filesystem, what could be better?
A version control system with atrocious object retrieval performance, and with which you have pin everything yourself (or pay someone to pin everything) anyway to guarantee that all your stuff aren’t lost? No thanks.
You have to have files on your system anyway to work on or use the files. How is it any worse to have it pinned? And if everyone working on a project keeps a copy of the canonical branch there's no central place you'd need to look for the files, just query for the hashes of the files. Github and the like are quick fixes for the shortcomings of things like git and mailing lists, I think IPFS could help actually resolve those shortcomings.
