I am of firm belief that the ONLY money that should be in circulation (at least in America) is what is legally permitted per the Constitution which is gold and silver. While it hasn't happened yet, I think that it is quite possible that some of the cryptocurrencies out there could become centralized. And given that it is a digital currency it could mean losing access to your funds.
What are your thoughts?
http://www.trustnodes.com/2017/07/21/bitcoin-become-centralized