Well if you get qualified to work in Australia through Australian Registration, via studying there, the the world is pretty open to you. As for the USA, well if you study there you pretty much are stuck there. i.e. No Aussie, UK, NZ or South African registration. Not even sure if Canada accepts the US undergrad degree?

The main problem is not what they teach, it is the scope of the actual study - it is far to narrow to satisfy the actual job of a physiotherapist in many other countries.