This is a really good essay that I read long ago. My view is... you got nothing to worry about. Between how hard Chinese is to learn, and the eagerness of Chinese to learn English (http://www.newyorker.com/reporting/2008/04/28/080428fa_fact_...) and the fact that even at current rates of growth it'll take decades for China to catch up means English will be the default international language for a long time yet.
