Contrary to what some might like to thing, for a community of any sort to grow and thrive, it has to, well, you know have somewhere to grow.
I am a huge Disney fan, but one reason I was drawn here was because it was such a hotbed for activity of all sorts... and in my short stay here, the Debate board was, by far, the most interesting on the site. I'm a regular forum junky: I'm a member of various online communities, and the debate forum here had perhaps the most well-spoken, intelligent people of any board I'm a regular visitor of. THAT's what kept me here.
I stop in on the "Disney-oriented" boards occasionally, but generally speaking, that's because I'm going on a trip in two weeks. After I get back, why does it matter after that? Why should it matter to anyone? The community board remains intact, yet it does nothing to "further the purpose" of the site... why is the debate board any different at all? I'd be inclined to think that the ultimate "purpose" of any message board is to retain a large, diverse group of people with an established sense of community... the idea of centering it around Disney is a tertiary descriptor, nothing else. We're all here, we all love Disney, but should we drop the other elements of our lives at the door?
I've been a member of GameFAQs.com for almost four years, yet, I rarely talk about videogames there. The forums have erupted into some of the largest social boards on the internet, united by a common interest in videogames... from the War on Terrorism boards, to 'Life, the Universe and Everything,' there are thousands upon thousands of members. The REASON, of course, is that most users have a sort of "forum conglomerate there:" There's not much of a need to go elsewhere to converse about things online, because everything is at their fingertips.
I think the only thing you're doing here is sending a strong message that you don't really give half a damn about the people who frequent the debate board: You don't perceive a need to have it, but I assure you, there's less of one to take it away now that it already exists.