But why ? Because it's the first cryptocurrency created, and the most used in the market ? What makes you believe that Bitcoin will be the eternal king of the market, and something else won't replace it ?

I'm surprised everydays of peoples saying that "btc will be the king forever" without delivering a proper argument.
That's why I created this topic, not because I want to know "who will be the next king" or "BTC will be replaced soon", no, I want to hear a proper opinion on this matter, without some BS such as "it's the king, because it was the first". In that case, why would he's still be the "king" right now, and why would be he be in the future ?