Israel, the Great Commission, failure, redemption?

Though it is theologically accurate to claim that Israel was to be the recipient of New Covenant promise; though it is true that Messiah came ONLY to the children of Jacob to proselytize them with the Gospel; though it is true that Jacob’s children were foreordained to be a blessing to all the Earth as they were commissioned to take the Gospel to every Nation, every Tongue, and thereby bless the Earth with Elohim’s offer of Grace through Messiah, Israel FAILED as they rejected Messiah; Israel failed as they rejected the Gospel by clinging to Torah/Law/Self-righteousness; therefore, the Gospel and the New Covenant were taken from Israel and given to the Gentile until such time the “fullness of the Gentiles have come in” (Romans 11:25); that is, the New Covenant will remain in the custody of the Gentile Nations until such time the number of Gentiles to be redeemed by the Gospel has reached fruition; then, an anointed 144,000 Jewish Witnesses (Revelation 7) will proselytize a “remnant” of Israel’s children during the war that prefaces Messiah’s 2nd-Advent, this Jewish remnant will be witness to the 2nd-Advent of Messiah as He returns to Mount Olivette and they will believe and receive their Messiah, they will enter the Millennial Kingdom and serve Yeshua there for 1000-years. ONLY A MERE REMNANT OF ISRAEL’S CHILDREN WILL BE PRESENT IN ETERNITY IN THE NEW JERUSALEM; THIS, DUE UNBELIEF IN SELF-RIGHTEOUSNESS (Romans 9:27-29; Isaiah 10:20-23).