Gentile inclusion is Abraham’s blessing arriving on schedule — not Plan B after Israel fails a future test.
The dividing wall of the Law marked Jew and Gentile in the old administration. In the Messiah that wall is announced as finished. Matthew shows the opening in narrative before Paul explains it in letters.
Magi worship. A Roman centurion is said to have greater faith than anyone in Israel. A Canaanite woman is given bread. The risen Christ sends disciples to all nations.
By the time the temple fell, mixed congregations already existed across the empire. AD 70 did not start inclusion. It removed the institution that had been used to deny it.
The nations are not guests at Abraham’s table. In Christ they are family.