I guess it depends on how it's written. Lorna may encourage Northstar to be in charge. I don't think she is going to be a secondary character, I think this is going to be a true ensemble. Admittedly there is going to an arc about Northstar and Kyle and how living on Krakoa is impacting them, and obviously one of the first arcs of the book is to find out if Aurora is still alive or not. Leah will give Lorna her chance to have an arc too, and Rachel as well. Leah may continue using Lorna the way Hickman did as the reader's perspective character that the story is seen partly through her eyes sometimes. Hickman already laid down some threads that Lorna is unsure about Krakoa and her place in it, asking herself if she is more than just Magneto's daughter to everyone like she was on Genosha!
I just feel until we read the first couple of issues we should at least give Leah a chance to show us what she can do with our favourite characters. I was really pessimistic about Rachel in Dawn of X before the X-Factor announcement, X-Men 1 and 2 was so disappointing for me because Rachel wasn't anymore than child #1 for Scott's story and she barely had any personality beyond being a generic daughter with attitude! At least Lorna was allowed to have some voice in Dawn of X, still mostly about her relationship with Magneto, but still a voice with her own opinions and concerns. I was at the point where I just wished the would let Rachel bond with the Phoenix force and leave, just up and leave and go into space to never be seen again until some writer actually wants to write her with a real voice and mind.
I think Leah is going to do justice for Lorna and Rachel so I am going to give her a chance. Hopefully we can discuss the story going forward, because I love Lorna too and I do agree with you that she gets set aside for other characters far too much. I also agree with you that Lorna should be as far away from Alex as possible. I don't mind scenes with Erik trying to be a father to Lorna, because I love stories where families try to overcome past mistakes, and these aren't Lorna's mistakes, these are Erik's mistakes, and Erik trying to earn Lorna's forgiveness for his mistakes, and approval for his current choices. Just like I enjoy when a writer actually addresses Jean's real feelings about Rachel and struggling to be a mother to a girl who is just a few years younger than she is!
Don't be too pessimistic, I think we have some good stories for the characters we love so much coming up, and I can't wait to see Lorna and Rachel together again because I love them as teammates. I still remember that Lorna was the only one who was actually a bit concerned about that Phoenix forced Korvus thing and was trying to help Rachel figure it out because she thought that it was happening too fast for Rachel and Korvus (Lorna was right, and I hated that relationship as much as you can't stand Lorna and Alex together)!