Considering that this arc has gone downhill, non stop and without brakes, I'd say it's impossible to save this arc. The main plot points kicked in long ago and trying to knit it all over again is senseless. I feel like the fights, characters and enemies have been so poorly handled and so hyped that this arc is a letdown all of itself. But that's another story.
The only way to end the manga without the bitter taste of a disappointment would be with either a very good final fight against Acnologia (which I don't think will be great seeing how much plot convenience does all these time travels and portals Anna's plan has) or a great twist. Maybe someone dying? For real, I mean. Having dragon slayers go back to their time or something, or Lucy rewriting the book of END, plotwists in general would be good.
I think that the Spriggan plot just long gone it seems. Brandish has vanished, all main Spriggans have been defeated and the plot is focusing on the END vs. Zeref and Acnologia matter.
Unlike other friends of mine, I don't think that shipping would actually save the day. I feel salty that Juvia was used as a plot device, that I didn't see Levy do anything relatively cool or Lucy having to get naked for fanservice sake. That's not how it should work – it makes these ships feel so forced. I don't know how a ship would save the arc, not logic to me.
This arc alltogether is a mess. Plotdevicing ships, overhyped enemies, biased Erz– sorry, I mean, characters in general, unbalanced fights (don't get me started with Ajeel, Lisanna and Elfman), nakama speeches, many convinient points (such as Anna suddenly warping through time and space, water-make blood, Wendy appearing on ALL the right moments and places...) and, in general, a disaster.
This arc is what the fuck-graded.
