Many companies start out with fairly simple websites that they manage by editing the HTML (and CSS and JavaScript) directly. But as the site gets bigger or more products are offered, it becomes more and more difficult to keep the information consistent with your brand and your marketing messages. That's when most companies consider upgrading to a content management system (CMS).
Sadly, while you (and your boss) may recognize the value of a CMS, there are going to be people in the organization who don't value it. In fact, there may be people who will actively try to sabotage any attempt to move your site into a CMS. So it's important to understand their concerns so that you can overcome their resistance and embrace the benefits of a managed system.
Read the article: Overcoming Resistance to Content Management

Resistance is inevitable. While the changes are most probably for the good, people would always have their reasons to resist though it would only do well for the company. The boss should have a good plan on how to lure the people to agree.
All the companies I have worked for, and all their clients have always used CMS systems.
I think its rare to see a site that doesn’t these days.
@Petah: I’m jealous!
Other than bloggers, I still run into clients who want me to build a site for them that they can manage with Notepad and don’t want any type of CMS to get in their way. It’s less common, but still out there in my circles.
Some people resrict to the new technology like CMS as they afraid of results of using new system, whether it will work better for them or not, so if organisation take such people into its consideration about making them feel free and secure about new system, the restrictive force from these employees can be handle properly.
When something new is implemented, people will always resist. That’s because most people don’t want to be taken out of their comfort zone, so as much as possible, they resist. However, once they understand why the changes are implemented, they will eventually embrace these changes.
- Jane