Good point above because as Danny Kaye concluded without birth control there is No solution.If there were no death despite what you say (that there is no birth without death), at a certain point people would stop having children. That's one possibility. Meantime, as I look around many people have children because that's what they think life is all about. So they have children in some cases born in miserable conditions, to not-so-good parents, or single parents who just got pregnant because that is their life style. Once Revelation 21:1-5 is completely fulfilled, we will see what will happen to continuation of the human race.
On TV I never see any fathers being held responsible for the on-going poverty children they help make.
In So. America one man said he needed lots of children so at least one would survive to take care of ->him.
As far as the human race is concerned I find procreation will cease according to Genesis 1:28.
People were only to multiply until Earth was populated, Not over filled. Not over populated.
Thus, procreation was to cease at least here on planet Earth.
As you say we will see what will happen after Rev. 21:4 is completely fulfilled.
Everlasting life on Earth is only for righteous people - Matthew 5:5; Psalms 37:9-11; 22:26
So, any who choose to be or remain wicked will be 'destroyed forever' - Psalms 37:38; 92:7; 104:35; 145:20; Proverbs 2:21-22