When you see that same media pumping hysteria about the crashing dollar -people will be scrambling to get out of it and will be looking for somewhere else to put it . Granted - precious metals will be very popular - but as the demand for hard assets increases and the price goes through the roof .. crytpos , which will have established themselves by then , will start to look real attractive as a trading currency. As long as people can spend it - they will use it - they just need to know that they can spend it -so a lot of the work is going to have to go into getting global merchants to jump on board.

Even with all that said - I believe that it is just a matter of time before crytpo represents ALL currency - this is the digital age wee already use digital money in the form of debit cards and credit cards- as they usher out the paper dollar , consumers will get used to using digital currency. Once everyone is on digital money , or even sooner they will announce a need to make it more secure - so they will transition it to the blockchain and before you know it , that will be only form of cash and several decades from now , they will look at a stack of money , the same way we look at confederate money - more of a novelty, than a functional currency.

I expand on that a little ore here on my rebuttle to this post:
https://steemit.com/crytpocurrency/@jorlauski/my-personal-opinion-on-why-the-whole-world-will-submit-to-cryptocurrency