"Disruption" is the keyword for the 21st-century economy. There is no such thing as a stable corporate empire now.  If you need a perfect definition of "nouveau riche," look no further than Crypto Castle, and the preening Jeremy Gardner, the poster child for the cryptocurrency millennium millionaire. Before you cheer too loudly for the fresh face of a new generation, remember that forty years ago, Boomers were a bunch of hippies having love-ins in Central Park. What's this guy going to be in forty years? You better hope he turns out nice.   First came the Internet, the World Wide Web, and Amazon. Retail malls dried up gradually in an event we now call the "retail apocalypse." The wealth shifted, from big-box retailers to indie web kiosks, which then grew to replace the malls. There's a whole category of urban explorers on YouTube whose entire channel is about filming dead malls. The founding of this art form is credited to Dan Bell:       Next came the gig economy.   Employers had…