I disagree... Even though I'm in favor of a WYSIWYG editor (ACP enabled/disabled), an admin should always have the option of allowing/disallowing features on his/her site.
I second, err, third this!
I do not see why this should/could not be an option in the core (minus all the work that does go into adding something like this). As we get older we tend to be more resistant towards change. However, even an old lass like me thinks that this would be a great option. I have run several gaming communities as well as support communities (professional and private) and having a wysiwyg editor is something most gamers do prefer. Most of the site owners or my bosses (depending on where i worked) almost always chose VB just because of the wysiwyg editor. My company and community still uses phpbb3 because I believe in this project.
Leaving the option in the ACP would be a good balance and solution for those site owners that do and
do not want the editor.
Just my 2¢ worth,