What are the chances of living in a world with no actual money ? 
Low. I think personally that cryptocurrencies wont make FIAT useless, but I think that cryptocurrencies will work hand-in-hand with FIAT money. Especially in countries like the United States, and the other first-world countries; I don't see FIAT going anywhere soon.
I agree. I am not saying cryptocurrency does not have the potential to make it big, or at least, as big as money. However, I think that fiat money has proven itself as a major, if not, the main player in the market, which has been widely accepted by many and are being used more comfortably in making deals all around the world. So, instead of phasing money out, I foresee that if cryptocurrency would continue its rise and recognition from people, it could have the change to fight toe to toe and interplay with fiat money instead of killing the latter out. This would help in making the market even more active and vibrant.