They can clearly delineate between team and personal accounts, force team storage to certain directories, and/or not allow users to manage team/personal accounts with the same login.
I was specifically responding to the previous comment, to explain why Dropbox can't simply revoke access to team storage files at this point (because they can't guarantee what constitutes team data). However, I'm in agreement with you that Dropbox could introduce new features to prevent this situation from happening in the first place, and had already noted as much in a different comment.
