No country will like to lag behind as long as a country like the US has been involved or leading in this bitcoin reserves, it's more like a guarantor to other countries to start getting involved, it can also be noted in the speech of the India spokesman as he referrence the US to have a bitcoin reserve.
My concern is that wouldn't the IMF want to interrupt just like they wanted to to interrupt Pakistan for proposing bitcoin reserves. They always want to come in between the success of countries that they aid.
I don't think they will do it when bigger countries enter the stage.
They don't have as much influence as in the smaller countries.