I don't really have any sort of "deep" observation to make from this chapter in Genesis. It is a surface truth that really finds its way through all of scripture. God restores. He redeems. He renews. I have seen this theme carefully shown even in these first ten chapters of the Bible. When Adam and Eve sinned, even though there were consequences, God clothed them, provided for them, and even though they were expelled from Eden, that was a gracious act so they not eat of the tree of life and live forever mortally bound to sin.
God was gracious with Cain by trying to reach Him even as He disobeyed. He reached out to the rebellious heart and spared the life of the first murderer. God was gracious to Noah...he found grace in the eyes of the Lord. The entire line of Noah was spared the flood, and afterward populated the earth, leading to nations of people who spread across the globe. God graciously restored a world destroyed and promised never again to wipe out humanity as He had then.
God restored the human race through an extended family. He still restores the human race through the family of the Church. Jesus called us salt and light for the world. We are scattered through the nations as God's redemptive influence. This is something God has always done: restore and renew and replenish the earth.