i think in crypto currency, bitcoin don't have competitor but in other investment, gold is the heavy competitor because gold is use by the many of people which have money to buy gold. so bitcoin is still be the king in crypto currency and its never replace by another crypto currencies.
you are right that no one can be replace bitcoin by another crypto currency because bitcoin is very much stronger and powerful currency and i think bitcoin is much more better and profitable than gold and people like to invest their money in bitcoin instead gold.