Kyoukai has just offered her whole life, but I have a feeling she will stay alive anyway and as long as she does I don't care what happens in this story, I'll keep reading it.
On the other hand, if Kyoukai dies(god forbid) then with Houken gone, all of the butthurt readers can be relieved, since that would be it for the purely 'magical' aspects of this manga. Anyway, since the very beginning we've seen generals cut through 5-7 people and blow away horses with every superhuman swing, so as long as some kind of 'mages' aren't used as a major plot point by casting fireball spells across the battlefield, this kind of mild 'magic' is totally within the setting of "Kingdom".