I wonder if this change would also reflect the fact that the WT does not seem to be growing in developed countries. Years ago, Catholic missionaries were still mostly white. There seemed to be millions of French nuns and Canadian (Quebecker), Italian and Spanish priests. I honestly don't recall ever seeing a young French nun. So maybe something like this is happening to the WT?
Mormon missionaries used to be blond Americans, invariably, but these days there's always a blond and a brown. The brown is sometimes American born, but not necessarily. I think this reflects demographic changes within Mormonism.
Was Gilead the only place around the world where they trained missionaries? What about other countries?
I assume that they will try to convince older couples to live in Third World countries so they can "stretch" their money, as Painted Toe Nail said. Maybe you guys are aware that, for example, Central American countries and Mexico are attracting American baby boomers, because their income would follow them. Some countries even have laws to this end. I assume the Watchtower would ride that wave.
I met American witnesses who, as a matter of routine, travel South to receive medical treatment.
Shopaholic made a good point. If there are no sponsored visas, then it can be somewhat harder to stay in the country of choice. Your residence visa is approved on the basis of your own merits for it, not on anything related to freedom of religion. It also means you have to prove you can work. But Third World countries generally don't impose restrictions on migration, for reasons that, I assume, are obvious to all of us.