Yeah, you'd think Hong Kong was handed-over from England where they speak to English to China where they speak Mandarin or something.
You write like as if it's a bad thing for a metropolitan world-city to have more than 1 language. Is it?
Try this thread: http://www.geoexpat.com/forum/showthread.php?t=2381
Independent of competitive pressures to be a cut above the rest, I think it's great to learn new languages. We have many different cultural influences that colour our world; our food, our movies, our fashion, everything. Why not in the words we speak? A globalised world brings about common conveniences, sure. But languages are in transition, they are dynamic. The language we share with our parents, friends, and workmates has its own aspects we don't expect others to share.
I hope you don't approach learning languages are a chore, just to get more jobs to apply to. It can be a very rewarding experience, socially, spiritually, philosophically. For example the lessons I learned from a year of Sign language several years ago have helped me immensely to better express myself visually, a skill that is paying off when I try to communicate with people I don't share a language with. Also helps me teach when teaching English too.