I enjoyed this hot trends post from AVC's Fred Wilson the other day.
Maybe it means something for you, maybe not.
In 2016, AVC lists 'bitcoin' as a hot thing. I prefer the term cryptocurrency or even blockchain, but I won't argue that one or more crypto currencies will seriously disrupt the banks and fiat currencies.
Fiat currencies are currencies like the US dollar, that are supposedly backed by nations. But, as you can see from our post today that links to a WSJ article on the failure of our federal government to contain its size or respect its debt obligations, fiat is indeed ripe for disruption.