I don't quite see the point of making it a multiverse with jump-in. At that point, it might become a risk that people screw over previous lore by making their own that contradicts other lores. Also, it'd defeat the purpose of making it persistent to begin with. Making something without permanent consequence or interactivity means you may as well start your own RP in free/casual/advanced.

Expanding Horizons is a neat idea, but the Guild doesn't really have the playerbase to support it in a healthy manner. A project like it reminds me a lot of forums dedicated to RPing one specific setting, which often end up failing after a year or two, if they're lucky. There's some exceptions, but those tend to also be incredibly huge, which E.H. isn't.