“My son has been working in Australia the past 11 years. He caught the last Quantas flight to the U.S. out of Sydney a week ago.”
That makes sense. There are maybe missionaries and teachers abroad, too. I can see not wanting to come back if where Americans are does not have the Covid19 as bad as it seems to be in the USA. What will coming home do at this time?
There simply isn’t a good general reason for US retirees to go back to the US at this time. There are individual, personal exceptions of course.