Market forces can be tough to predict. There was a dearth of software engineers in the last 8 or so years and many of us have reaped the rewards. The hacker news articles used to be about switching jobs every 1-3 years to advance your salary and career. I don't see so many of those these days, which makes me suspect that many have found themselves in senior-level or managerial roles that they find satisfying, and maybe some found themselves in architecture roles that are very difficult to advance from (but still pay well).