How should I completely disable the visual and html editor from pages? I know I can disable the visual editor in my profile, but I am trying to lock down the content input areas so that my client doesn't muck things up.
Why not use custom post types and don't add any support for the editor, that is afterall what they are for and the easiest way . The answer in this post covers how to do that,
To remove that functionality for pages or posts (and custom types) you can try and use
A hacky solution is to use CSS
Think this might be what your looking for, code and more info from wpsnipp:
i've altered it from using user levels to using