If you mean non-random, then who decides? Morality, productivity and purpose are culturally and individually relative. Having the majority or even a powerful minority decide what future children should be born is even more authoritarian than the first approach.
If you're worried about the planet not being able to support too many people, there are many other options that promote kindness, respect and privacy while promoting a sustainable environment.
The only viable avenue is education and even then life is very much geared to beget more of it. And that's before we get into life extension.
The better alternative is to get off the planet. The only reason we are exhausting the planet is because there is more of us every day and the same amount of planet to be divided.
Or there might be some man made or natural disaster around the corner, one thing is for sure: it will not continue this way for much longer.