But while we're on the subject of this book, I do think that we've established that attempts to revive the Heinlein juvenile* are really hopeless at this point. For better or worse it's an obsolete genre and we just have to move on.
* Robert A. Heinlein wrote many popular young-adult science fiction novels such as Have Spacesuit, Will Travel and Podkayne of Mars that are fondly remembered by SF fans who read them when they were kids. Some of those fans-turned-authors have been attempting to re-bottle the lightning from time to time, always with embarrassing results. Their fundamental problem is that "We should write science fiction books that appeal to teenagers" is a great idea, but writing them to appeal to teenagers from 1958 is kind of missing the point.