Yeah I don't think enough of the global economies will. You have to think economic power rather than just raw population numbers. The easy majority of the world's economic powers are Western.
That's actually what makes me kind of bullish for BTC becoming the world's reserve currency. There's a not totally outlandish scenario where an alliance of various nations ( China, Russia, Saudi Arabia, Iran, whomever) dethrones the dollar, but they aren't able to replace it.
You are left with a global reserve currency vacuum and BTC is uniquely positioned to fill the vacuum. It's an already established deflationary digital currency that isn't controlled by any one nation.
There's a million "ifs and buts" of course, and BTC is not without it's own flaws, but there's certainly a non zero chance it happens.