GVFS, or something like it, is an important development for git. Facebook already implemented something similar for Mercurial[1]. At a glance, GVFS hints that git has become more extensible than it used to be.

The merits of a "monorepo" have been hashed out previously[2], it's more nuanced than "lol, M$".

[1] https://code.facebook.com/posts/218678814984400/scaling-merc...

[2] http://danluu.com/monorepo/