God was giving Abraham an opportunity to use himself, his immediate family, and his life to help achieve God's eternal purposes. God was not offering Abraham blessings for no greater purpose or reason than the physical well being and earthly happiness of Abraham. God was offering blessings to Abraham IF Abraham would develop the faith that allowed God to lead him and IF Abraham would accept the responsibility to be a blessing. So let's leap ahead 2000 years. Jesus Christ is alive and working in his early ministry.
All humanity is blessed in Jesus.
God kept all his promises to Abraham. The descendants of his son Isaac became the nation of Israel. He made Abraham a wealthy man. He gave Abraham a name that is still known 4000 years after he lived. He blessed Abraham's friends.