Do you guys billieve that bitcoin will become the only one currency that can use as a mode of payment in the whole world? How is this become posible in the future?
I doubt that. Althrough we use Bitcoin to buy pretty much any other coin, I think Bitcoin is by far the favorite candidate when it comes to global usability. There are other coins that deserve that spot.
Bitcoin can be said as the most widely used digital currency because it has a popularity and a very high level of trust compared to other digital currencies. Altcoin also is a fairly digitized digital currency, but now Altcoin still can not beat Bitcoin as the most commonly used digital currency. So it's normal when almost everyone in the world uses Bitcoin as a tool of financial transactions compared to Altcoin.