Problem with a rotation scheduled is... not everyone will follow it. You'll always get a few people wanting to try solo, pick up groups, or even just grievers "hogging" the slots. There is also a language barrier, will *everyone* be on board with this idea? The only solution to this *if it even is a problem, since SE won't give the details* is a status list of some sort at the adventure's guild indicating how many of the instanced slots are filled, or an official SE sign up board / queue.