It's pushing her away from what every other bit of software on her system, including the OS itself, has trained her to do
But that's not true if you're the kind of user that uses VIM regularly, since many CLI (ncurses) programs use the same keys. And even on the web: Gmail, Google Reader, Google+, Reddit, Jira, Tumblr, Tiny Tiny RSS and others support J/K for up/down navigation.