Roger is no longer important to the narrative.
Now that we got a bigger picture of the entire lore in One Piece, with the previous worlds, Roger is nothing more than a big fish in a small pond. He also realised that and said "They're too soon" because Roger knows he isn't Joyboy/Nika. So what is Roger in comparison to entities who are capable of destroying the world?
He isn't also the end goal of Luffy's dream, he aims higher than being the PK.
So yes, Roger is done.