Frances, Heleen and Tonya have proposed a model of co-chairing for the 2017 conference (and future ISRII conferences) that involves a 3-way partnership between the convenor of the current conference, the convenor of the previous conference, and the convenor of the next conference to facilitate learning and passing on of information between past/present/future organisers.
I think this is a great idea! In addition to mentioned learning/experience benefits, it will force us to plan our conferences further ahead, which I believe will have a knock-on affect on attendance. I would suggest to make this mandatory/expected for present and future convenors and optional/relatively light work for past convenors.