The expats then leave jobs in their home countries which simply moves the shortage around rather than solves the problem. There is a thread running on one of the Australian forums about Aussie Pilots being able to work for US regional airlines.
Australian pilots can work for US regionals.
Australia has been a source country for Pilots but is now experiencing its own shortage and has been recruiting abroad which would have been unthinkable 20 years ago.
We could be experiencing a demand similar to that last seen during the growth of civil aviation after WW2.