I believe, some countries are already doing this but maybe they are silent about it. I don't think other countries are just sitting around and seeing bitcoin's price increase steadily for years. It will be a good addition for the public to know that governments are now trying to get involved in this market and not banning it. Ordinary people will have more confidence in jumping on in this market, hence, further increasing the demand of this cryptocurrency.
Except for socialist countries like China, North Korea, they may be secretly accumulating bitcoins without us knowing. But the rest of the world, capitalist countries like the US, EU, Japan, South Korea, everything they do has to be public. Because any important bill must undergo discussion, hearings, and a vote. There is no authority or individual that has the power to make a decision that compels the government or parliament to do something silently.
The purpose of governments and central banks is to seek safe, stable assets to secure the national economy. They are not like us, looking for speculative, high risk assets for high returns. That is why the Fed and ECB have publicly stated that they are not interested in bitcoin and cryptocurrencies because they do not meet their criteria.