Like I said before, I actually wouldn't mind Cersei actually surviving and not having any part of the final battle with the White Walkers. Afterall, the focus on your series is restricted to Winterfell/the North, so to cram in Cersei just to resolve a plot, however important it is, would reek of artifice. And yeah, I get that it's cathartic to have Jaime serving that justice upon Cersei but it seems kind of in-keeping with the fantasy tropes that GoT was all about subverting (and that later seasons of GoT were undoing the work they established in the beginning/reverting to cliched tropes...). I know it'd be very anticlimactic to have Cersei dealt with off-stage but then again the focus is on Winterfell and King's Landing, Cersei's domain, is far away. It's a tricky one.