Why delete any posts in this thread ? They're at least interesting. I suggest you delete some posts in "who's next?" instead, before that thread starts getting popular again...
It has been discussed on many occasions and one reason for not deleting them is that it would screw up members' post numbers.
However, my own opinion is that many of the general chat threads are waaaay too long now. This site is a Tokien site with discussions and resources and anything else is just fodder as far as managability is concerned. If those threads are too long and unwieldy then they can be 'culled' without harm to the site. Yes, people's post numbers will change but that is a small price for a tidier more manageable site. They are not Tolkien related, they have had their day, no one ever reads back and they are repetitive, if at times funny. They do serve a purpose and I am in no way suggesting that the threads be stopped but I would be happy for them to be thinned out.
That is my view and I don't yet know the views of other Council Members but if we discuss it my vote would be to thin the threads unless there is a valid reason not to (apart from post numbers).