I didn't realize it was so difficult for western people to permanently stay in foreign countries.
I thought it was only the other way around, because the "rich countries" don't want "poor foreigners."
Economically, it seems clear to me that countries always benefit from more loose immigration regulations (gradually loose -- extreme change can cause problems), but it's because of the bigotry of the people involved in government that immigration regulations exist.
Still, if you're a western monk, why stay in Asia? You might be more beneficial to people in the west.
Monks with Asian accents and bad English, while western people find them alluring, are not always as easily understood. And there are people like Gil Fronsdal, who are so brilliant, but they don't describe things with a rigorous adherence to the Pali text, or have any monastic authority, so people don't take them as seriously. Also, it seems like there are so many Buddhist temples in America that only (or mostly only) cater to Asian groups. But there is already a plethora of monastics in places like Thailand, isn't there?
The best things in life aren't things.