Sorry, I wasn't clear.
I'm pretty sure I've heard Jason talk about possibly playing for the Wallabies, and he's on a contract that will allow eligibility by the time it ends. He's about as 'Australian' as Tui Lager and fits the example of Savea that you gave.
I know what you mean, but I think it's apples and oranges.
Sure, having people who are clearly not Aussies play for Australia with 3 years residency isn't perfect. But it's a necessary international qualification mechanic because one could easily fall in love with a nation and be invested enough to represent it after a certain period of residency.
Now, Woodward has made a decision to be in Oz knowing:
a) It will preclude him from being an AB in that time period.
b) That at the end of his contract he will qualify to play for Australia.
If another player comes here knowing that he could be called up to the ABs at any point, but never gets the call and decides to play for the Wallabies then no sacrifices or commitment have been made. They missed their train to the AB jersey and we're the next best thing.
It would be a sad state of affairs. Sure, it would be by the rules and like I said the rules are written that way for a reason. But still, a sad state of affairs.