With almost 8 BILLION people on this planet soon, not everyone can meaningfully contribute to something that can't be done more efficiently by automation (which is also cheaper for everyone and easier on the environment) or done away with entirely. See [1], [2], [3] for examples from our not-so-distant past. You just cannot expect everyone to "earn" money while expecting technological progress to continue unabated. D…
What reverses sterilization? Money? The possession of a certain ideology? Do you trust government in creating ideal criteria for which germ lines should live on - when the human genome project was such a failure?
The only criteria a government needs to check is whether the couple has lived together for a certain amount of time (say 1 year) without an incident of domestic abuse etc. or a past criminal record involving child abuse.