The crypto market has a king for a long time. And he will always be. I can not even imagine a situation that could happen so that any of the coins could shift Bitcoin from the first place.
Bitcoin can be replaced from the first position, that is something that might happen. Today many coins are starting to crawl up like Ripple who replaced Ethereum in second place, the question is when did that happen? maybe no one can answer with certainty.
Basically the altcoin price follows the current Bitcoin price, when Bitcoin rise, it is likely that the altcoin will rise, and if the price of Bitcoin decline, the altcoin price will fall. Judging from the market share of Bitcoin which still dominates around 53%, Bitcoin will remain king at least for the next decade.