For me to this day the best use of Bitcoin, in the sens that no solution in the whole world can compete with it or be at the same level, is gambling. Imagine you're burried in debt, you have money problems, you're bank is closely watching your accounts... The only solution to be able to gamble safely is to use Bitcoin. Moreover you'll keep all the profits, unlike when you bet with cash. That's just an exemple but there's probably many more.