I had this thought come into my head the other day. With the end of the US as a sole superpower with the ascension of China in world politics, what will become the new language of trade, communication, etc...? English is already used in international trade, air communication, scientific journals, and so on. With that entrenchment, it's entirely probable that English will remain in large use even if it recedes from the position as lingua franca. English is well known for it's many inconsistencies and exceptions however, which can make it difficult for people to learn. What do you predict will happen with language in the future: will we continue to use English as a language of commerce and trade or will it be supplanted by another tongue just as it supplanted French?