Git is distributed, but obviously you're going to have a canonical repository somewhere (git.kernel.org, for instance). Decentralization doesn't mean getting rid of a canonical place where approved patches end up, and you really aren't going to see canonical repositories disappear, we have them for a good reason.
However, there is something to be said about mirroring canonical repositories for accessibility.
However, there is something to be said about mirroring canonical repositories for accessibility.