No. The CPA should not be about Magic only.
Part of the CPA's momentum is having the ability to talk about a great domain of things. We are unlimited as to what we can discuss.
However, I think that sometimes people just go overboard as to what they're discussing. Like those threads concerning "the events." Those kind of threads should be restricted by now, because they generate new wars, are breaking people apart, and they don't even give anyone any new information.
Magic, politics, movies, music, whatever -- it's all good. Just make sure people don't go too far into one end of a subject, especially if it's been done already.
Keep the CPA's spirit alive by keeping the diversity, but and getting rid of absurdity.