Absolutely bitcoin still be the most popular coin, when people start to know cryptocurrency bitcoin was the first coin they know and they don't know any altcoins yet. This is why bitcoin still popular and hard to replace.
bitcoin will never be replaced, some cryptocurrencies try to replace bitcoin as the most popular cryptocurrency but the result is not there, just boast and crap, bitcoin will never lose popularity, let alone the advantage of bitcoin very much when compared to money or gold