Bitcoin is going 9yrs old, so far no alts surpasses Bitcoin. For 9yrs it remains the king. While Bitcoin is going down, no alts remains strong. All alts are crashing too. This is the best indication that Bitcoin has no replacement.
True but remember, that was 9 years ago. The technology at that years and time are far different and more advance today. As what bitcoin's purpose of existence be an indicator to its price, together with its character of being the first in its kind and the market, it will always be the King of all Cryptocurrency. But we cannot dictate time and the future. Possibly an alternative coin has character, potential and more beneficial purpose to everyone, then reaching or being higher in bitcoins price is possible.