I remember reading an article about this several years ago, predicting this very situation. At the time the article said that many young Chinese and Japanese college students viewed the job of pilot as a mundane job which involved long, unsociable hours for relatively poor pay. At the time the students interviewed were almost all hoping to go into the technology sector and not a single one had any interest in the aviation field. If the article is proved right it would mean the increase in jobs there are not due to expats taking jobs from the locals, simply taking work noone else wants to do.