I do not know what to say about this article about Singles, other than it does not exactly work within the Catholic worldview.
Whatever else we can say about the gifts of Singles (and there are many), keeping down the numbers of new babies is not one of them. Chastity among Singles does, of course, prevent children from being conceived in the less-than-ideal circumstances of Single parenthood. But babies are good. Having babies is good. Not having babies should not be rewarded with cash handouts. In fact, how much nicer to have a Baby Bonus (as my mother used to get) than a No-Baby Bonus. If I got a No-Baby Bonus, I would save it up and use the money to adopt a Baby, just to spite the social engineers.
Single people have just as much interest in the next generation being happy, healthy and plentiful as parents do.