[vetrom]

Invest in (or build?) an enterprise content management system for people that don't, for whatever reason, think of SCM in terms of commits, branches, and graphs.

If you can make one that thinks in terms of git on the backend, great.

If you want to go a bit further, you could expose the underlying operations to the user. You will need to get them to reason around and interact with the minimal requirements inherent to a versioning system, namely explicit versioning and an explicit commit process, along with explicit merging and conflict resolution.

There are GUI clients that help with some of this, but you're not going to get away from some concept of dealing with branches and merges in any SCM. You hear about it less often, but you'd have the same troubles dealing with a chewed up repository in Perforce, ClearCase, or the like.

(edit: even Subversion!)