That would work as well, since my point is that the games shouldn't share names or sound strongly related if they aren't, though I don't see much of a reason to rename the original because of a new setting.
Also, I'm not saying we should use the 4th Age thing - it is simply one of the possible ways to make sure that the setting can have a new name.
I think the first few polls should be on basic world shape, world features (Sea/Wilderness as a transitive plane), home area shape (i.e. Greek vs Caribean model), and home area features (portals). The features should wait after the shapes, though, unless they are generic enough, since they might end up problematic within the rules. There are admittedly overlaps between shape and features that aren't easily separated, though I think it could work.