IMF is already considering crypto as a new form of currency. With the current technology the world have, they are already aware that BTC will be useful.
But, I think this will take years to be used in full. Crypto is still in development stage.
That's right of you say the IMF too issuing an international reserve asset called the Special Drawing Rights or SDR, which may supplement foreign exchange reserves of member countries. The total SDR allocation is currently around SDR204 billion (approximately US $ 290 billion). IMF members may voluntarily redeem SDRs with their respective currencies.But it's true it takes a long time.