Obviously this idea doesn't have much chance of becoming a reality in the near future. So I think we should be realistic instead of expecting things that are too far-fetched.
I'm also skeptical about it becoming a reality, but considering who the US president is and what kind of people he surrounds himself with, I wouldn't be surprised by any decisions regarding cryptocurrencies - be they positive or negative, short-term or long-term. It has always been much more realistic for me to expect that less developed countries will be the ones to support BTC in some way.
In the long term, it seems to me that the entanglement of high politics and national interests in the context of Bitcoin will not end well. They are all obsessed with having as much control as possible, and how are you going to control something that is decentralized?
Only if they have enough that would be possible, but it simply wouldn't be true.
Do you think the US or others wants the reserves to control Bitcoin? - I do think that now their goal would be the biggest out there regarding reserves, but not the amount to be "in control", of course. They want the prestige of being the leading power in that regard. Trump loves flashy things like that.