Many argue that one of the altcoins can probably in the future beat Bitcoin and be number 1 in CoinMarketCap. I believe Bitcoin will be never beaten by any altcoin, especially centralized one, because Bitcoin is decentralized, is the first crypto currency created, and worshipers of Bitcoin will increase over the time.
If another Bull run happens, Media will only talk and focus on Bitcoin, new comers in crypto will learn about Bitcoin first and foremost.
I believe in crypto. But I worship Bitcoin. And all the coming bull runs will be led by Bitcoin.
And even doubt is not necessary with such a market and alts progress. It's all clear that until cardinal changes are made, Bitcoin will continue to have a total capitalization of more than 50% over the rest.