This is not something intended to be completed overnight (or even in 2 weeks). It's content that's supposed to last us the majority of the expansion. There's no deadline that has to be met on this. There are no new rewards being unlocked with the new stages at this point. Being behind is not an issue.
Once things calm down from the normal release of new content panic, SE will be better able to evaluate what worlds if any might need the help from cross world players to meet whatever internal expectations they have for world progress.
I don't expect Wanderers to be locked out of the Firmament permanently, just until the content has been out long enough to give all players a reasonable chance to participate on their home worlds.
