HOWEVER, that doesn't mean it can't be done. In fact, if there are ways to visually simplify git and make it more intuitive for non-programmers, those techniques could wind up making git even better for programmers too.
I could also imagine a convergence of the git model and the wiki model someday -- where anyone can edit (like Wiki), but where there are branches, merging, etc. Obviously, a lot of internal wiki's don't need such complicated version control, but for things like Wikipedia, it could be amazing.
I think there are a lot of areas for working on writing collaboration -- group projects in school, business proposals, technical manuals, all sorts of things.
And the main attraction for users over, say, Google Docs, is that your changes don't overwrite others'. The fact that your edits create a "branch", that then others can accept/reject/modify/merge, is a vast improvement in creative collaboration.