Bitcoin is the benchmark for altcoin prices, when the price of Bitcoin falls, Altcoin falls, when the price of Bitcoin rises, Altcoin rises.
There are no other coins that can challenge Bitcoin now. Altcoin may continue to increase now and then but there is no possibility that one of them might pursue Bitcoin or its market capitalization. Their prices are interrelated and I don't see any way in which Altcoin will take over bitcoin. Bitcoin is the king who will not be defeated by all cryptocurrency in the next few decades.