I think nowadays most sub-consciously agree that although we are one people and may be united, but all should also celebrate their culture and its uniqueness and that our differences make this (blue) planet a much more beautiful place.
But ... the discussion at hand is about the common language of aviation and its implications on safety. There were clearly two ways: one was to invent a new language which perhaps borrowed a little bit from many languages and was easy to learn, as in Esperanto (it might still be a choice for a Universal auxiliary language as it is far from dead), or two was to choose from the existing ones. If a language has been selected to be communicated in the skies of our global village, then it should be practiced by all parties, including the ones that might have voted against it. Otherwise, the spirit of unity is broken by not enforcing the decision of the majority, not to mention the safety risks which were the reason for making such decision in the first place.
It is important for every one to speak at least one other language which helps us understand one another better, especially if it were a common International Auxiliary Language spoken by all. Today, that language has become the American-English; however in due time, it would be more befitting for the peoples of the world to either select or invent one. The universal participation in its selection will likely make its implementation more acceptable to all, however in the meantime and as far as AVIATION is concerned, every one has to keep their end of the bargain and communicate only in English on the radio.