No, it’s not going to replace the dollar, or any other fiat currency.
Yeah it isn't going to be the main currency of America, they are totally devoted and used to depend on their own currency which is dollars.
And besides, dollar is well known and being regulated by them and many other local currencies are depending their economies into it.
To the extent that it becomes successful, it will serve as a complement to fiat currencies, as well as other cryptocurrencies.
No it isn't going to become successful that it will come to the point of making it as main currency.