I just realized that he's working on a weekly magazine. Even if this first issue sells like gangbusters, won't they have to prepare the next week's issue as well? I guess the novelist and mangaka can write in serialization, but they'll need a new pinup model, new interviews, etc.
Of course, once this launch is a success, Sora will move on to another project as usual, but this is gonna be a tough act to follow for whoever gets stuck managing the magazine after him.