Jerry, i'd agree to a point that on a serious topic it is better to stay with the main course of the topic. That is why a forum needs moderators, to ensure that topics that derail or go off topic can be tidied up. But in topics that aren't so serious, it's good to have a little light hearted humour or banter.
I often wonder whether the option to view recent posts adds to the problem. For some reason, I have never got into the habit of using this feature on any forum and rely simply on the icons of each forum section to tell me where new posts are to be found. This does mean that I can simply pick the topics I want to read, without having to scroll through all the replies in general.
I am sure there are quite a few of us that want to move with the BIR quest. New members joining will almost certainly want to. Topics will get repeated and old ground re-covered. But we have have to encourage people to post if we are to move forward.