Email 2.0 - Annoying Email Threads

I think one of the most annoying things about email are never ending threads. One of the things I would love to see Microsoft and Google come up with a thread detector. After about 5 or 6 conversations it would say, "On going Thread Detected. Would you like to move this to a forum." Built into the email program would be a forum where the message would transfer too. It would then notify all of the vested parties that you can complete the discuss at http://whateverforum.com .