"The IMF is, after all, a global body controlled by its members governments of different countries. The fixed number (21 million) of bitcoins that can be issued is also a disadvantage the IMF will want a currency whose supply can mimic the global growth in trading volume. This is one reason why other currencies were added to the SDR basket, apart from the US dollar."
Total bunk. If fixed supply assets cannot be used to expand world trade, how did world trade expand before the 20th century, without the "magical people" (i.e. central bankers) and their magical paper tickets?