Heb 8:13 In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.
The old testament system, the physical, was going to totally end in 70 AD. It still existed for a generation, but the system was on it's way out. The physical Temple and the Physical City was going to be destroyed.
The dispensationalists are like the Pharisees of the Gospels. They can only see the physical. They are like Nicodemus, not understanding that the New Birth was spiritual. He could only think physical, kinda like you.
The Lord Jesus does have a people, He calls them his children.
There is a nation of Israel today but it is a Spiritual Nation, a Holy People.
Rom 2:28 For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh:
Rom 2:29 But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.
The difference is that the Israel of God today, the people of God, are now born not of fleshly parents but of the Spirit of God.
These verses INCLUDE us(the church) in the promise to future Millennial Israel of Jeremiah 31, Monterrey!
They do not replace them with us.(the church)