Jesus, those are alternatives on the complete opposite sides of the spectrum.  I'd say going back to a gold standard is ridiculous at this point, at least in the U.S. 
We've gotten so far into the free money printing that I don't think there's any going back from this--there isn't enough gold in the world to back all the money we've printed.  It was a nice thing for many years to have something backing up the currency, but I don't think that's even necessary anymore. 

The crypto idea is more of a solid one, but I don't think governments OR banks are going to get behind this unless they come up with their own crypto.  Bitcoin will forever remain borderless, IMO.  Banks are always on the receiving end of hate because they have all the fuckin' money, plain and simple, and they charge you for it.  I don't think they're afraid of crypto, but they sure as hell are being slow to adopt it.  Not sure they ever really will.