Forgive? I don't know if I would "forgive" anything. This type of thinking seems foreign to me, like Lucas is some dysfunctional family member that we have to come to terms with. He is an artist and a custodian of national treasures and he gets judged the same way anyone else in his position would be. Did people "forgive" Ted Turner because he released the black and white versions of his colourized films again? I doubt people think about it in those terms, but I'm sure they are greatful he did so. I am also sure they still dislike the fact that he had the nerve to colourize them in the first place.
The OT SE would still represent a butchering of a classic. People have the right, and are right, to complain about the sheer existance of this.
Lucas would have still repressed the OT for well over a decade and impeded a lot of people' enjoyment of their art and culture, as well as sullying the memory of those films. This should not be forgotten, as though it didn't happen.
Lucas has more to attone for his actions rather than "I'm sorry." In fact, restoring the OOT wouldn't even be saying I'm sorry. Lucas would never say or feel such a thing. IMO all it would be was, "here you go, please get off my back now," even if this seems like a cynical perspective of mine.
Would the resentment die down? Of course. But in the larger picture, Lucas cannot undo his actions and change his past. He can lessen how harsh history will judge him, but what is done is done and that fact alone is not worth forgetting. Everyone has to live with the actions they take, even if they redress them later.
Jebsus Zombie, you're in a mood today.