That dream of yours would be great, but that's too far from reality or even happening. I also aim for Bitcoin to achieve more and to be widely accepted but the idea that it will be a primary currency while fiat would be second seems to be less possible. A country wouldn't agree to let their their own currency to be an alternative on their own country. Plus not all government won't agree to use a decentralized currency as their main currency because they cannot control it.

I am not against it but I just think that's too far from reality.