It is Obvious there is more useful coin now, and most people prefer accepting Bitcoin when you give them option what coin they accept. The altcoin exchange is a playground for speculators, and I'm surprised Bitcoin still has such high % of the total market cap when there are hundreds of altcoins and their market cap is so much higher than their real coin usage would suggest - but it is how market cap works, pretty inaccurate measurement of coin usability. Obviously, bitcoin has no competition in popularity nor price on.
Yes there are many coins that are profitable like bitcoin but they cant overcome bitcoin because bitcoin is the most trusted among all the coins. Bitcoin is the king of all crypto currency, it dominant the crypto from the beginning until now. Despite the dropping of its price, it was still choosen by people because it is the most potential coins because it has no competition.