I don't think that's how it works. At the end of the day, what matters is his revenue graph. If almost all his revenue comres from iOS, and Reading List muddies the water enough to cut into that, the "cross platform" checkbox isn't going to save him, because it's not relevant to the majority of people who pay him.
I don't think iP is doomed, for what it's worth; I just don't think this is the answer.