Facebook announcement will drive massive adoption. Governments will be concerned, since FB could be bigger than any nation!!! I think central banks will work with companies to adopt these technologies. FB proposed a stable coin backed by FIAT. This in many ways different that the crypto eco system. Think of it as a block chain technology applied to facilitate cheaper transactions aka a facilitator for fast transaction of FIATs.. If the idea is constrained within these boundaries, central bankers will be on-board