I am most scared about dumb money and their dumb decisions. What I mean by that is all the people speculating on the price movements rather than appreciating and valuing the underlying technology. Thanks to the extensive media coverage in 2017, it seems like everybody and their moms are in crypto to make a quick buck! While this created the bubble we are in, the technology won't be able to catch up with the overvaluation and the bubble is gonna pop sooner or later. I wish the dumb money rather tried to find a way to help this technology evolve, because that will be the ultimate way to mainstream adoption and therefor justified moon prices!