I don't believe the market actually is bad for people with a modern systems programming skillset (not least because we have trouble hiring those people), but I don't doubt that there are systems jobs that used to be common that no longer are.
Nobody has a license not to adapt. If you're stuck in a crappy job working overtime solely because you're stuck maintaining AIX database applications, it's hard to blame the structure of the job market on that. Get thee to Github.
One, I wasn't referring specifically to myself.
Two, I wasn't referring to someone who never learns new things. What company do you work for? We may have spoken before on this subject...
Three, not everyone is in Silicon Valley.