Actually Bitcoin price often influence altcoin price but there's a season where altcoin do extremely well even when Bitcoin is stagnant or declining. What if this season comes More often, what will be the faith of Bitcoin?
If people loss faith in Bitcoin then the market would crumble.
An altcoin or two can rise when Bitcoin is declining in rare cases due to FA
but most times their direction is influenced by Bitcoin and even after a pump
It usually falls lower than its lowest. When Bitcoin pursues ATH, altcoins pursue LTH.
The probability of the above happening is waning
Because interest are flying into Bitcoin more.