I think it's best to change up the content on your site fairly regularly, at least with every new Google update so that fresh, quality content is added frequently. I get nervous if my site sits too long with no changes and think static sites will lose popularity with the search engines.
About a year ago, I began an effort to move a lot of my sites back to static html pages. They're more secure and easier to support. If it's a site you don't intend to update on a regular basis, static is the way to go.
I am doing well with static websites. Or better, my static websites are doing better than my dynamic websites.
It sure is hard to manage a static website, but it's a bit more secure as you don't have to worry of sql attacks, but I like the idea of not typing the html and let the software handle the html.
Bye
