Barry Silbert says that it is time for millennials to go all in on bitcoin. He says most alt-coins will go to zero. They do not have a workable product or are outright scams. Bitcoin already won the race to digital gold.
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Why it's High Time for Millennial Crypto Investors to Go All-in on Bitcoin
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I don't think all altcoins will go to zero but I do think that all but a few will. Smart contracts, privacy, and specific utility coins have valid use cases. Security tokens and NFTs also have a strong use case. If the entire world can get scammed by the fractional reserve lending systems then I think anything is possible. :)