The problem with the crypto-currencies is the difficulty in purchacing anything with them in the 'real world'. If that gets addressed, the price will rocket further. But to take worldwide standardization in implementation is far from a sure thing. Far far from a sure thing.
There are certainly issues that still need to be resolved when it comes to buying and selling in the "real world." I was looking into using it to buy and sell on Esty and I am really excited about the fact Paypal might start using it too. I sell alot on ebay so it would be great for me. It will be an exciting journey for sure.