There'd been many reformed antagonists: Luna, Starlight, Sunset, Discord......
There're also many antagonists that are still considered evil (totally or partly): Cozy Glow, Tirek, Queen Chrysalis.....
Which of the following predictions do you prefer?
1.There'll be no antagonists left not reformed before G4 ends. Or, at least, EACH villain will be explained overtly to be good in one way.
2.There'll be, at least, one antagonist left not reformed before G4 ends. Or, in another word, there's REALLY unchangeable darkness in Equestria.
I choose the latter.
Sorry for my poor English. I'm not a native speaker.