Although that's true in principle it's a little idealized: HTML5 development on mobile is still a little half baked and impractical. You only have to look at Facebook's massive abandonment (at least temporarily) of that platform in favor of the native API.
The whole point of the article is that while there are more paying customers in the iOS world NOW, it's unlikely that the situation will continue to be true given the current trends.
The whole point of the article is that while there are more paying customers in the iOS world NOW, it's unlikely that the situation will continue to be true given the current trends.