I don't see how people immigrating to Canada could force those born here to do a poor job learning their own language. In fact i don't see how the colour of their skin could affect either their own or anyone else's ability to learn. I suspect most of these "multi-cult" people which you disparage know their own language better than most Canadians know English. And I am sure that most of them know English better than the vast majority of Canadians know French, our "(distant) second language".