So far, nothing has come along that is better than it, and it has almost a decade of positive reputation to go along with it... so why would it be replaced?

The only way I see it ever falling from the crypto-throne, is if the idiots who control it make the death-nail-in-the-coffin mistake of creating more than was deemed possible by its founder.

Then it will lose its gold like standard, and will become just another shitcoin for the world to waste their time and hard-earned money on. If it remains finite, it will always reign supreme.