Lets talk about this when bitcoin goes mainstream. Maybe it will take 3 more decades for that.
I dont know if you're one who believes in the collapse of fiat, but should the world's reserve currency of the US Dollar collapse I can see global adoption implementing like a domino effect as the world struggles to regain monetary stability. (in my opinion it would be much faster out of sheer desperation, like 5 to at most 10 years)