I don't think it makes much sense to go switching posts and forums and whatnot. It just gets annoying and confusing. If the conversation strays off-topic then the new off-topic topic is the topic. See what I mean? It's like if you're in a grocery store and you start talking about car parts to your friend and the store clerk tells you to bring your conversation to the AutoZone across the street.

Furthurmore, diverting off-topic comments and the like only creates more unneeded threads- like there aren't already enough!

But I do agree that the original post should be in the appropiate section.