Let me guess, while I wasn't paying attention, Sir tx3000 got banned again?
Well, aside from that, I think nothing is stopping anyone from opening a new thread on the same topic if they feel there's still room for discussion (which there probably is if the discussion got derailed before it even came to any conclusions).
And if closing threads is such a problem, why not resort to deleting posts, trimming a thread back to its relevant content, if it gets out of hand.