Agreed - "indefinitely" is stretching it, but as long as you can continue to demonstrate that you have "substantial business, cultural, employment or personal ties with Australia which are of benefit to Australia" and you come back fairly regularly, then you remain eligible for a one year RRV under current rules. As Marisa says, policy suggests that "In general, it becomes increasingly difficult to demonstrate substantial ties of benefit over extended periods of absence. This is in part because the longer the period of absence the more difficult it is to continue to maintain ties of sufficient import to be considered ‘substantial’."