I don't think we have five years before agentic coding becomes the mainstream context in which professional software development happens. I think we're talking about two or three. Possibly less.
If that sounds alarmist, I'd ask you to consider how it would have sounded in 1983 to tell a mainframe developer they had about eight years before their core expertise became a niche. Or in 1994 to tell a desktop developer they had about four years. Both of those statements would have seemed extreme at the time. Both were accurate.

