You make several excellent points, and I generally agree with them. BUT there is one very important point that I think you are missing and that is that crypto's current $750 billion market cap is nothing. There is an enormous amount of money that is going to flow into crypto in the next few years and I think a $10 trillion market cap for the entire space in 5 years is not at all unrealistic.
Granted, this is a long term view. If you are speaking to the short term only and expect to see an alt coin pullback and a Bitcoin bull run, you're probably right. But from a "Crypto Investor" standpoint as opposed to a "Crypto Trader" standpoint, I think anyone who is diversified between BTC and the Top 50ish Alt Coins is going to do just fine in the long run. Sure, some (plenty?) will go to 0, but the winners are going to win BIG.
Thoughts?