well it's the fact that the story is what we make it, i'm not terribly interested in the grail war, it's just a common clear staring point.
Well, perhaps, but I would like Sakura's role to be reasonable in the story, and the Grail War is going to cover a large part of that story, if not all of it.
In particular, I'm not sure what would come
after it, at least in terms of the main story itself.