Any other thoughts on Ellis's column? I want to encourage the discussion as I welcome everyone's thoughts on this matter, as the discussion may impact some future decisions I may make for these forums.
As there is only very limited number of users hijacking any topic with their 'internal' ideas you may introduce a new tool, that is used only by admin - warnings
3 warnings = interdiction of writing for 1 month.
5 warnings = ban(no read, no write) for 3 months.
It shouldn't be a lot of additional work for you. I know some version of software offers this functionality.