Hello Cary,
At least in the academic frame of reference (is there any other where papers are an established production format?) the incentive to respond to a formal call for papers depends directly on the attractiveness of the publication venue.
It also usually depends on the credibility of a peer review process so that the academic can count it as an official publication. If we need to cater for this market specifically - one approach is to create an online journal, where the best papers submitted on GNSO issues are published - with an appropriate peer review process. In any case, all papers will be published online and archived. A selection of substantive papers will be presented via oral presentation. Both an audio file and a full transcript of any oral presentations will be made for the public record. Regards, Bruce Tonkin