^ Well, I think that we have already been introduced to a villain who lasted for more then a single arc, and that is... Acnologia and Zeref - while Zeref's role as a villain is rather questionable, considering his behavior in the Tenrou Island arc... Anologia is definitely going to be someone who is going to be defeated in some way, one day.
Personally, I also doubt that true purpose of the current Eclipse plan, is going to be fully successful - after all, we got some multiple instances showing the destruction of the Royal Palace, which most likely ... isn't something that the Royal Family and the Kingdom of Fiore want to happen.
I think what the future Lucy is going to do... is to just prevent the ones who have apparently died in the future (the people who's name's, where desirability left blank in the chapter, where the future Levy has made an appearance) .
Other then that, I think that the Future Lucy would do anything else, since - while I'm still not quite sure if Mashima is going to use this rule of traveling, usually, if you change you're past too much, the time line that you came from, might be destroyed as well.
In other words, I think that Mashima is going to impose some limitations on what the future Lucy can change in the current time line, and due to that, she won't be able to change everything that is going to happen on the 7th day.
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