If this happens, chances are high that nations will be dragging who will hold more because no one wants to be left behind. Imagine what this will do to the price of a Bitcoin.
When the US made the announcement on allocating part of their treasury into Bitcoin for a long period no nation responded to it. Trust me when I say most nations still do not believe in Bitcoin, regardless of the news surrounding it and the interest of the Americans some nations would rather sit and watch everything play out. And one good reason they will remain adamant is that they don't have the same economic strength as the US in terms of finance to the US is far above them. Only countries with valued currency can stand to buy Bitocin without any melting down of the economy.