I strongly doubt this will ever happen. Bitcoin is very different from a national currency and it will stay that way. National currencies main role is to regulate their economy, while Bitcoin is a different kind of animal.
One way or another, everything will depend on the government, which, first of all, must decide not only on plans to reform the country's economic and financial system, but also on the desire to carry it out. The fact is that national currencies are depreciating and it is no longer a secret for anyone that fiat currencies have exhausted their capabilities and only harm society, while providing an opportunity for malicious manipulation by the government.