The previous 'Dance Teachers Forum', and then the 'Technical Discussion for Dance Geeks' were my favourite threads in this forum, and I have missed them a great deal over the last couple of series. I even tried bumping the Dance Teachers one with some questions for a couple of years, but there was insufficient interest to keep it going.
So, I have more recently confined myself to lurking and not getting sucked into all the nastiness that abounds. But, I would definitely keep an eye on, and contribute where I can to, such a thread through the year. Of course, the advantage of keeping going outside of Strictly-time is that if no-one posts for a day or so it doesn't disappear off the bottom, and maybe we'll have a good little community well established ready for next year.
So, good luck for whoever wants to start it. And if it doesn't keep going, it doesn't keep going; at least you've tried.