Xu's argument is sort of contradictory and cynical. after some many years working in new oriental and selling young chinese students the american dream, now he is saying that studying abroad is not equal happiness.
indeed, the reason why many people going abroad might be jus that we always think the grass is grenner elsewhere, or people might simple to know another culture and another lifestyle.
i really appreciate what xu wrote about studying aboard not equal happiness. he never said that we should not go aboard studying, but we must be clear at our purpose of studying aboard, and we must be clear: studying aboard is only one of the procedures of our way to happiness, it is not study itself.