I wonder what the life span for cryptos will be? Is it like a fad, where everyone had to have a website, then everybody needed their own app, then everybody needed their own twitter account? Is this just a passing wave of another evolution of technology that will fade as everyone moves into the next thing.

You probably could make money with cryptos, many people have. But I see this as a race, where cryptos are like Tesla and an metals are an old 747 who's technology has been around for a long time. The Tesla will look remarkable on take off but the 747 will eventually catch up and will really take off into the sky.