well I think what matters is that everything is tied up in the end. I don't want to see the series left hanging. Atleast give some Factions a conclusions (Apple juice, Flute etc.) I don't think its possible to end everything in one Volume. T^T
I would've just gone with "...kaere" if I were you
IMO if SR ends anytime soon it'll be a forced and crapfully done ending regardless of final pairings. Hell, I'd rather read a well developed Flag ending than a hastily tacked-on Onigiri ending, and I can't stand Flag.