See, I really think Star Wars being a cultural phenomenon will attract the GA, even those that aren't huge SW fans just because it'll be hyped up as the "must see thing" since most people will be seeing it. Unlike Godzilla, SW doesn't need excellent marketing campaigns or trailers (although obviously that would help). The name itself is going to sell. And let's not forget who is dishing this out, Disney. If Disney can sell to the GA GOTG, a movie from which not many except for the diehards have heard from, then I think they can sell SW to unlimited heights.
Let's put this into perspective.
Let's say 10-15 years from now, what if by some possible means (I know this case scenario is highly unrealistic but bare with me) either Disney or some other big corporation were to buy the rights and name of Harry Potter and decide to extend that series past the last book and have the same old cast come back, but he main stars be of their kids.....
Don't you think that would sell out like crazy? Harry Potter, like Star Wars, was a huge phenomenon, even more so WW. Same applies here to SW.