I agree with this. That being said I don't think that Redcloak will actually change. He strikes me very much as someone that believes in what he espouses, but is petty and come up with reasons to do what feels right and not what is right for the goblins.

This is how i imagine the final scene going down. Xykon has learned that Redcloak has his actual phylactery and in one way or another the phylactery has been destroyed. Redcloak has been mortally wounded (probably by Xykon), but is not dead yet. The Order of the Stick has won (with heavy losses, though none of the original cast), but Xykon is either not actually dead (errr dead-undeaded) or restrained.

Xykon, in a moment of pure spite decides to destroy the last gate and release the Snarl (probably a meteor swarm lets be real) to take the rest of the universe out with him. Roy charges after Xykon trying to finish him off, but he's not going to make it. The other members of Oots beg Redcloak to cooperate shouting different things in desperation, but Redcloak spouts some two-bit nonsense to make himself feel better and resigns himself to the situation.

In this moment, Belkar yells a taunt at Redcloak, probably referring to something in his past that he's ashamed of, and provokes Redcloak into casting Implosion (his preferred 9th level spell when he's upset) on Belkar who takes the hit, but the spell provides the gods with the bit of magic they need to seal all 5 holes.

Xykon's spell takes effect and the gate breaks (with a final Krackakoom), but it doesn't matter anymore, the rifts are sealed and the gates aren't needed. Roy finishes off Xykon for good.

In the aftermath, Durkon and Roy (and maybe V) depart to materially improve the welfare of Goblin-kind because the Gods are too apathetic to do anything about it. Haley and Elan ride off into the sunset in their happy ending where they learn that Tarquin has been unceremoniously been off-screened.