A top executive at a major Wall Street bank is deep into his spiel on how artificial intelligence (AI) will make the firm smarter and leaner when he pauses to take a question: What does this mean for young people entering the business? The silence grows. "It's, um," he says, shifting tone and making clear he can't speak publicly. That question is gnawing on him, he confides, because he has kids. "I would want them to pick their careers very carefully. I think AI is going to eliminate most jobs.