World crisis in 2018, I dont see that happening, where is the source of your write up, or it is just a mere speculation, if it is, when economic crisis happen, it will have a negative impact on cryptocurrency, because many investors will want to convert there token to fiat in other to survive, with this CRYPTO will be affected.
I am sure he does not have any write up, he probably just read up some old predictions by some old cargoes that saw a looming crisis in this year and he also decided to key into it. Even if there would be a world crisis, no one knows when it will happen because for some reasons put together all at once, it just starts gradually until you see it reaching its peak. It has happened before, with some bad policies, trade wars and whatsoever, it can happen again, but no one can tell when it will. Nonetheless, if there ends up being one, I guess that would really help mean a whole lot for the crypto space.