Virtually every answer here was a lame "nO oNe KnOwS" or "we'll blow ourselves up." While both these answers are true, they are boring and don't answer your request. Here are a few awesome old school Discovery Channel-style videos discussing the possibilities of the future:

https://www.youtube.com/results?search_query=what+will+the+future+look+like

Kurzgesagt's Future Humanity video https://www.youtube.com/watch?v=LEENEFaVUzU