The problem is that the article misses is that there is an opportunity cost of specializing, specialize in the wrong thing and your career is over. Try finding

The problem is that the article misses is that there is an opportunity cost of specializing, specialize in the wrong thing and your career is over. Try finding a Cold Fusion job now that it has seen it's glory days, sure they are still around but if you loose your job, it may be a long road until you land in another job that fits your specialty. At a certain age many developers do specialize, many of them tend to sunset with a widely adopted technology. Take COBOL for example, if you participated in COBOL development you would meet a lot of specialist, because most of the people in that technology are past the point of choosing to specialize. Participating in the latest technology is always going to create a filtered bubble of generalist, those are the ones that have less opportunity loss in transitioning.