This seems like a bad criteria for many reasons. What about people who delay procreation till their late 30s or 40s? Or people whose children have died?

Then there's a category of people who resent their children and younger generations generally.And another category of childless idealists who feel protective of humankind and the planet as a whole. Would you approve the resentful and deny the idealists?

The idea seems pretty flawed and unjust...