I think one of the best cases against crypto, is just how much the volatility in Crypto is a feature not a bug. Crypto is how people will make it rich, and rising 7% in a year doesn't enable that. Imagine a world where crypto routinely beat the major indexes by a point, so bitcoin being worth now around $1500, Eth $200. They would have been one of the most fantastic investments you could have made, and still a robust currency, but how much hype would they have made?