I don't know if countries would go for BTC, if anything I think this could pump local capital markets, if I am lets say Brazil and I am sitting with a bunch of rubles or Yuan I don't need to manage my FX, its a melting ice cube, I can probably put some of that extra capital in gold and settle up with the various BRICS nations, or the easier thing to do would be to swap those Rubles or Yuan for that currencies bonds if its got a decent yield or go into their stock markets and buy up shares in Russian and Chinese companies.

I think thats where this money will flow first before it flows into bitcoin