Bitcoin is the first ever digital currency. I've learned so much from this amazing invention. Now everyone is trying to copy bitcoin to make their own money. Bitcoin had made me money, it has gave me a new experience to the modern economy. Bitcoin will not fail as long as there are sellers and consumers.
Bitcoin is the first peer-to-peer currency largely accepted in the world, there are another "electronic currency" before it (bit-gold, for example).
If it will not succeed, the blockchain will rest for sure and the people will create another form of currency. Because everyone has the right to issue his money.