I'd go as far as saying most networked concurrent file access will ruin your life one way or another, because it's just a hard problem, and it's trying to solve it at a very odd layer; a "classic" fs can't really take advantage of higher layer transactional or other known constraints in order to make things work better…
No, Google Docs solved a different problem at the right layer. Their solution isn't transferable to other specific problems that may currently be approached using networked file systems, let alone the generic case.
