Oh, sure! Bilingualism has worked so well for Canada, hasn't it?
It isn't the language so much that has proven a problem but the overall culture of Quebec that is the issue. In a lot of ways Quebec has made its bed and now has to lie in it. It is proving very uncomfortable because of the isolation. Quebec is not located in France or even Europe but they want to be. It is going to continue being a painful existence as long as that prejudice exists.
The FCC should ban all foreign language broadcasting. All government offices and all businesses in interstate commerce should be required to operate only in English. English should be mandated as the official language of the USA. And only people who can speak, read and write English should be allowed to immigrate (and stay).
When I hear people spout that opinion I think of all the immigrants who either spoke no English at all when they arrived or use English as a second language. The Italian stonemasons of New England who built those beautiful bridges along the parkways. All the company's started by people like Andy Grove (Hungarian - Intel) that have made gigantic contributions to America. We are who we are not despite these people but because of these people. So long as we have a common language (English) why would we want to restrict individuals from speaking their language of choice? English is the de facto language of international commerce and aviation already. How much more is required to be good enough for you?