If you are asking about public policy that is a different matter. Simply put public policy is very complex and hard for us to analyze on a forum as people with no experience. There are rational choices that do not involve birth control. They aren’t easy. We as Catholics mustn’t stray from Catholic moral teachings (or try very hard not to). An idea would be once again to do with the redistribution of resources and focus on a simpler life so that more people can fit, or maybe even space exploration.
Also Matthew 6:25-34 on that one
25 “Therefore I tell you, do not be anxious about your life, what you will eat or what you will drink, nor about your body, what you will put on. Is not life more than food, and the body more than clothing? 26 Look at the birds of the air: they neither sow nor reap nor gather into barns, and yet your heavenly Father feeds them. Are you not of more value than they? 27 And which of you by being anxious can add a single hour to his span of life?[a] 28 And why are you anxious about clothing? Consider the lilies of the field, how they grow: they neither toil nor spin, 29 yet I tell you, even Solomon in all his glory was not arrayed like one of these. 30 But if God so clothes the grass of the field, which today is alive and tomorrow is thrown into the oven, will he not much more clothe you, O you of little faith? 31 Therefore do not be anxious, saying, ‘What shall we eat?’ or ‘What shall we drink?’ or ‘What shall we wear?’ 32 For the Gentiles seek after all these things, and your heavenly Father knows that you need them all. 33 But seek first the kingdom of God and his righteousness, and all these things will be added to you.
34 “Therefore do not be anxious about tomorrow, for tomorrow will be anxious for itself. Sufficient for the day is its own trouble.
I guess if it comes to the worst we’ll need to pray for a miracle.
*also “They’ll all go to Hell” is not the assumption. They could be ignorant, haven’t reasoned correctly, etc. Contraception is bad in and of itself, it isn’t our say to comment whether an individual or even a group is sinning, sinning mortally or sinning at all.