I think its a great idea to temporarily lock and clean the threads up. In the Badbob Match info thread, it has worked really well for quite a while now. If it can get us to keep more on topic and promote better discussion I am all for it.
I think once we get used to the idea, problems like Owzat had will disappear and people will adapt.
fingers crossed it seems like a good idea (hopefully not just at the time)
My one suggestion would be if someone has made a lot of effort to write a long post that is off topic and would normally be deleted i.e. Mick surprises everyone and mentions rotation in a thread, maybe they could be offered the chance to copy it to a more suitable thread.