I agree with you, I don't think they would spend that much money and go through all that trouble with the huge stages just to play north america and europe. they will start profiting finally off the start of their 2010 shows, so I'm sure they will try to work out the southern hemisphere as well.
I don't see them going to Australia or South America with the 360 stage. Too much money to transport the stage after Europe to South America and then ship it to Aussie.