Bitcoin are likely to be safe and it will take some time for the reversal process to play out and for citizens of the more forward thinking nations to pass up the attractiveness of bitcoin in the interest of a national cryptocurrency with a number of nations that have already recognized bitcoin as a legal tender, including Japan.
Bitcoin is not only a virtual currency, but also an investment that has lined many of its pockets with gold. It is unlikely that national cryptocurrencies will offer buyers a similar opportunity as the centralized nature acts quite similar to a paper tender where the value is likely to be controlled by the central banks concerned.