Is it even possible to make them understand that the without a younger generation there is no Worldcon? Or do they really want to cede the win to Dragon/Comic/Anime con?

Maybe it needs to be presented that way? Because if the 20-somethings and the publishers don't think Worldcon is important, the pros have to go elsewhere and it all crashes in on itself.

If that's really the truth of it, we need to find a way to communicate that truth...