No matter the number of years it will take but one thing is sure that crypto currency has really bright future. In 1999 when computers and internet was emerging, no-one thought it would be this big. In same manner crypto currency is gonna explode and would draw entire world's attention.
Everything is going digital and with everything currency would also go digital. All the crypto currency supporters are revolutionaries who are supporting something good for the future. No doubt, we have to suffer a lot for the future, but when time comes the longest jump would be ours.