DNS/DHCP Admin here. I rely on the incompetence and disorganization of management and engineering to keep my job. "We've always done it that way" means I'll work Monday morning. I've worked for a huge company where the DNS/DHCP support job wasn't even an on-call position because it was so well thought through- where there was only one person doing it full time, and even then he had time for other work. This is DNS/DHCP done right: automatically, protected, taken seriously as network services.

Then again, I've worked for that company when bought by a competitor who dismantled all automation and made it nearly impossible to re implement: they're at 10+ DNS admins and could use more. They could probably reduce their support needs by sending their admins to typing class.

My job exist because people don't want to look at the big picture and integrate all their network services. I rely on the "not my problem" gift of bad management. I know this and am glad I have other skills on which to fall back. All the tools are commonly available to automate my job. I'm just very, very, very lucky that it's easier for folks to pass the buck and not look at their own infrastructure with an eye towards competence. My biggest fear would, then, be a CTO who's done this before... With vision, direction, and leadership. I'll be out of a job and the company I work for would save millions and millions in people expenses, equipment, and support.