All current limitations of Bitcoin aside, remember that the entire system is ultimately dependent on Internet connectivity.  Any grand plans for nation state adoption require broadly deployed Internet service.  Yes there are technologies that address this but they are quite immature.  Just saying, it needs to be considered as a factor depending on who you're talking about.  Cyprus, as an example since it's the favorite mention du jour, does not have very good Internet service on the whole.  In fact, it's quite poor.