As long as there are coins like ETH, Monero, among others that are the first of CMC and as long as BTC remains high, altcoins will always survive, it is that BTC always gives them oxygen, in addition to that there is a crypto community that will always bet on altcoins, because firstly they are mostly cheaper and secondly when BTC goes up, altcoins usually leave bullish gains of 2x, 3x... and even more.