It is hard to say, for a very long time the United States has been looking into the structures of adopting bitcoin for it own federal economy reserve but since then, the jurisdiction panels in concerned has been debating from a point to another, one after the other up til this day that they have not yet implemented the Trumps proposal.
This is also decentralized financial system we are talking about here and a country can not just blindly take a follow up just because the US has done so. When the country faces with an economy breakdown at it cost I don't if the US will help out so, for any other country to follow suit, there must had been economical and technical analysis so they don't entrap their own economy system due to copying the US in the move on the decentralized reserve on bitcoin.