I get the feeling we haven't seen the last of him, and while some people want him to just go away, it kind of feels like his story arc hasn't quite been wrapped up.

To me it seems more like he's on the verge of a change, and that battle at the edge of the universe was just a catalyst for any potential character development

I'm honestly not sure how they'll bring him back and not make it "meh" but if there's one thing that the past 2 expansions have taught me, it's that you can't rush a good story, and if they plan on bringing him back I'm sure they'll lay the framework beforehand so that it doesn't feel contrived