Hittfled, one doesn't need to keep their money where they live, and you are claiming that residents of persian gulf countries are craving to move overseas, yet, this remains to be proven, even tax crazy France introduced special laws to attract them btw, so they would only pay taxes on their locally sourced income were they to become french residents (I haven't read of a similar exemption for any other country). Yet while I noticed quite a few high end properties in Paris belonging to arabs from the Gulf -mostly qataris- they appear to be occupied only a minority of the time.
The fact arabs from the Gulf dream of moving West, while their governments take better care of the needy financially (including subsidies on a lots of goods, money at most ages ,free health and education ) than most western nations do, and where the wealthy can thrive tax free, might be a dream of Hittlfeld at the end of the day.
I lived in several countries in emerging markets btw, and while the rich like to send their kids studying overseas, a lot of their kids, as well as their parents, find life easier at home.
Even in China it's complicated, many wealthy move out, but what proportion do they represent ? And a significant proportion of those migrants come back once they get a foreign passport or they at least have ensured a long term residency overseas. Salaries are increasing very fast and unemployment is quasi inexistent, I doubt nearly as many working class folks dream of moving out as they used to.
It's difficult to look at the West, especially Europe, and think it is the most promising part of the World where to raise kids (low pollution is good, but booming economies matter quite a bit as well )
Chinese definetely have concerns about keeping most of their money in the Mainland though, and capital controls don't help, but again it sounds reasonable to spread one's assets amond several countries and political regimes, one doesn't need to keep all his money in a bank next door, nor do many people with sizeable assets want this.