Bitcoin Being the king of the crypto universe has always influenced the price fluctuations of altcoins and is expected to do the same in the future. Altcoins are used way less than bitcoins and bitcoins have always dominated and are expected to dominate altcoins.
Bitcoin will continue to have the same effect on alts as long as it's the number 01 pair in all trading markets. It's still bigger than USDT and some few stable coins who gained a great position over other alts if we can consider USDT as an altcoin as well.