This actually works wonderfully if he buys up a lot of property. When everybody moves in and brings their money with them, land values shoot through the roof, and the people who owned that land make out like bandits. Folks who owned small orchards in Silicon Valley in the 1950s made out like bandits (assuming they managed it well), as did people who bought humble ranch-houses in the Boston suburbs in 50s and 60s.
Big cities in developing countries are expensive too. A better idea would be to find some beach property in South America; the continent is developing and getting older as well, so lots of people are retiring to the sea-side (as I said, big cities are expensive).
In the south of Brazil you won't find many bargains left, but I've read that lots os europeans are buying houses in the northeast (the infrastructure is a lot worse there, but it's 3.000km closer to Europe).
Ask the cubans that were forced to leave how much they got for their land. One of the things that people take for vantage and dont realize is the stability of the US government. I'm not saying that mexico is on course for collapse but the police have lost control of the north border
