I like how you think. Let's see if he posts anymore from that era...
I think you hit the nail on the head in terms of the potential for sustaining double duty for Betsy - Otherworld/Arakki/Amenth. Tini recently said in an interview that Otherworld is now established for her to play with later if she wants and for any of the writers to play with. Something about the way she said it gave me the impression that's exactly what will happen. With it being wide open to mutants now via Fort Krakoa, it offers endless possibilities. So I can see Betsy doing X-Men/Krakoa things while also holding Otherworld down. I liked when she was in the front of the council and they tasked her with finding a solution to Otherworld deaths, and how Emma was looking for her when relations with Britain took a dive. It seems her book is reestablishing the importance of the mantle with the whole, "Betsy has power in a realm that is huge and changing all the time and could threaten Earth at any time. She’s a good person for the Avengers and other people to know." Just like they did with introducing more Arakko stories, the writers can start playing in the Otherworld sandbox too and further integrate it with Krakoa and the wider MU. Perhaps even making a team of X-Men (or a new Excalibur) like you said for such missions as Redroot's rescue.