The old covenant ended 2000 years ago. "There is no Jew, there is no Greek".
I'm sorry, you cannot take this as justification that the covenant God made with the Jews has been revoked. God does not go back on his word, He has extended the grace given to the Jews before Christ to the gentiles.
We are like new branches grafted on the old -- we are not replacing the Jews but are now partaking with them and yet by accepting Christ's blessings we are partaking in the new covenant and in His grace.
The Jews who accept Christ's blessings are doubly blessed, but those who do not accept Christ are not "replaced"
God does not go back on His Word. He made a covenant with the Israelites and He stays true to His Word.
Romans 9:4-6 4 the people of Israel. Theirs is the adoption to sonship; theirs the divine glory, the covenants, the receiving of the law, the temple worship and the promises. 5 Theirs are the patriarchs, and from them is traced the human ancestry of the Messiah, who is God over all, forever praised![a] Amen.
Romans 11:1 1 I ask then: Did God reject his people? By no means! I am an Israelite myself, a descendant of Abraham, from the tribe of Benjamin. 2 God did not reject his people