The way this post is presented there is nothing in it that I would have reason to disagree with.
it must be pointed out however that some of the promises God made to Abraham were not eternal or inherited, some were eternal and conditional and some were eternal and unconditional.
The land promise as it was made to Abraham involved the children of Jacob and was eternal, but conditional.
The condition is in Genesis 17.
Genesis 17:
9 And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.
10 This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
11 And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.
12 And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed.
13 He that is born in thy house, and he that is bought with thy money, must needs be circumcised: and my covenant shall be in your flesh for an everlasting covenant.
14 And the uncircumcised man child whose flesh of his foreskin is not circumcised, that soul shall be CUT OFF FROM HIS PEOPLE; he hath broken my covenant.
That is the condition that Abraham and his family lived under in the holy land, and if any one of the males did not comply they would loose their right to stay there.
Before the children of Israel returned to the holy land, God added a longer list of conditions, on which their "right to exist" in the holy land depended (Deuteronomy 28).
AGAIN, this is how God/Jesus rectifies that situation:
Romans 11
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
27 For this is my covenant unto them, when I shall take away their sins.
28 As concerning the gospel, they are enemies for your sakes: but as touching the election, they are beloved for the father's sakes.
Zechariah 13 also shows you that God/Jesus will pour out His Holy Spirit onto them so (in my words) the veil will be lifted, they will recognize God/Jesus as their Messiah and they will mourn for the one that they lost, who will now use His Holy Spirit to turn their hearts back to Him.
Zechariah 13:
1 In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for sin and for uncleanness.
2 And it shall come to pass in that day, saith the Lord of hosts, that I will cut off the names of the idols out of the land, and they shall no more be remembered: and also I will cause the prophets and the unclean spirit to pass out of the land.
8 And it shall come to pass, that in all the land, saith the Lord, two parts therein shall be cut off and die; but the third shall be left therein.
9 And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The Lord is my God.
Zechariah 14
8 And it shall be in that day, that living waters shall go out from Jerusalem; half of them toward the former sea, and half of them toward the hinder sea: in summer and in winter shall it be.
9 And the Lord shall be king over all the earth: in that day shall there be one Lord, and his name one.
10 All the land shall be turned as a plain from Geba to Rimmon south of Jerusalem: and it shall be lifted up, and inhabited in her place, from Benjamin's gate unto the place of the first gate, unto the corner gate, and from the tower of Hananeel unto the king's winepresses.
11 And men shall dwell in it, and there shall be no more utter destruction; but Jerusalem shall be safely inhabited.
---