I don't think so, these are just speculations and not always a "True guess". The market needs are the factor here and not the words of these guys.. Even if they are early birds and adoptors, it doesn't mean that they are saying the truth or that their predictions will come true.
I do think that there's good alts just like: Litecoin, Dash, Monero, ZCash, Zclassic, Phore, Onion, Augur, NEO, Cosmos, Qtum, OmiseGo, Lisk and others. These are somehow projects with real goals that will bring adoption, trust, investors and they are old enough to be having a share. Some Shitty altcoins will die for sure but the other solid ones will survive. Ethereum will never survive if they didn't fix their errors and bugs and provide users with a Static and a fully working official wallet .. without fixing their blockchain, they will die for sure. That's what i'm guessing
DYOR, it's not a financial advice.