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?
Some Altcoins will experience an increase even though the price of bitcoin has decreased; this is greatly influenced by a certain group of people to boost the popularity of Altcoin itself. The goal is, of course, to make a profit in the way they do. If it works for a long time, it is possible that Altcoin can maintain its popularity ranking, but it all depends on the consistency of the related team to always develop the coins they launch.