Bitcoin's current market cap is above 66% of that for all the other altcoins combined. Even if it went down to, say, 40%, BTC still would remain dominant in regards to market capitalization. Bitcoin is the most trusted coin among crypto currencies, and, in fact, all the other alts owe BTC that they are getting any adoption at all. Can any of them replace the king? Maybe, but not in this universe, where, apart from being number one already, Bitcoin has the best team of developers around.
Let's accept the fact that there will be the time that bitcoin will get replaced by a better cryptocurrency. It might be already existing or soon to be released by its developers. Bitcoin is like Nokia which is the pioneer of the cellphone and now it is replaced by the better ones like apple, samsung, huawei and many more.
It is not about being the first or being the king, it is about the features and capabilities that you have an advantage on compare to others.That's right, and that's why I mentioned the team of developers. Situations with Nokia and Bitcoin are incomparable, in my opinion. Nokia produced its first mobile phone in 1987, when there were no Internet, or, at least, there were no global internet as we know it today. Nokia, by no means, was regarded as a symbol of freedom and independence by smart people around the world, and even if it were so, those people couldn't cooperate so effective as they can today with the help of the Internet. That's why Nokia lost the game, and Bitcoin will win.