7 days in Yoyogi, assuming it's sold out, would be 70.000 people (if we just think that people are not going multiple times). That would be great for a stadium or even Dome. And then Ayu would have to do only 1 or 2 shows, which would be less exhausting. But still it's always Arena, always Yoyogi.
I'm beginning to think there is some secret conspiracy to never have another Ayu Dome Concert. But why? A-Nation is in stadiums, too.