Gov. backed coins is the most likely scenario because if governments did let a huge percentage of money to disappear into cryto space thus greatly lowering the taxbase imagine all the freak outs and chaos when there is no money for roads, police, hospitals, schools ... Sorry folks you gotta pay for it yourself. I'll believe it when I see it. We haven't seen any form of anarchy successful anywhere that I can see. Maybe libertarians can all move to one crypto-state and show us how its done.