Alts will not survive this BTC crash
From your post, you should be rebrand yourself to OutsiderofCrypto. Have some faith in cryptocurrencies. There's only one bitcoin and everything else is an altcoin. If altcoins don't survive, neither will bitcoins. Both go hand in hand.
I am with you, but be careful with this sentiment. Hidden in your observation is the fact that Bitcoin is unchanging while 'alts' are changing all the time. This means, even if 'alts' survive, a specific alt may not. This is why you need to be careful picking them, and choose the high quality ones. Not all alts are going to come back once BTC recovers, only the promising ones with good tech and use cases will.