It's not going to do it anytime soon or likely even within 15 years, but it could in our lifetime I reckon. I think more economic instability in certain countries and maybe another financial collapse/crisis will happen soon rather than later and that could bring in many new people to bitcoin which could have a snowball effect.
absolutely not. there is no point in thinking it ever will replace any major fiat currency. just stop thinking/hoping that it will happen. it will not.
Why will it not? If in the future bitcoin keeps going up and fiat keeps going down which is what happens when they print more of it on a whim people might wise up. Money should grow over time not devalue and bitcoin could solve this and that's what's great about a deflationary currency.
yeah i think there is a possibility that it may be able to do just that, replace the dollar. although i think it most likely will happen not in our lifetime. it may take decades as fiat has been used too much and most are dependent in it. though a lot of people are using bitcoin already, it would be hard for other countries, especially poor countries that are having a hard time having internet available, to adopt a digital currency. so yes i also believe it can happen, but it will take a very long time
Possible situations might happen but same as you said it won really happen on our lifetime. As we all know that fiat is centralized by government and all of people do really use it for everyday basis and its the blood of a country where we are talking about economic state because if there no fiat a country would be weak for sure and no development hence fiat does circulates all over the world.