It is not that rest of the world that will subsidize. It is the international callers who'll.
0.019 < 0.02
Watch the units :)
I'm in France, and if i want to call France, i have to pay. But i'm not making any international calls.
What it can be interpreted to mean though, is that Google wants to focus on us audience first, as they do with nearly all their services.
I'm not in the US, but i'm fine with that. If they want to offer good service, they first have to make it viable economically.
I don't think it would be right to claim whole of US can't afford paying for GMail calls while the entire world outside it can pay more to keep it free for Americans.
Also, the free test call does not really work. When I end up creating an account, it says you have no funds. where did test call go?
From the article: "Calls to the U.S. and Canada will be free for at least the rest of the year and calls to other countries will be billed at our very low rates."
And: "If you’re not a U.S. based user—or if you’re using Google Apps for your school or business—then you won’t see it quite yet."
Also, you might want to check out the rates (they do seem pretty cheap for international calls, but I'm not an American so I don't know the standard): https://www.google.com/voice/rates,