Amos3:7 “Surely the lord Yahweh will do nothing, but he revealeth his secret unto his servants the prophets.”
Everything God does is known to God’s prophets. It is all in scripture. Our people are not a second choice brought in as an after thought. In order for there to be a non-Israelite people who have taken the place of Israel, one would need to find scripture where God specifically tells the prophets that God intends to bring in another people without violating existing scripture. Some think this is in the New Testament, but the Greek text does not support this. The answer is to find the real Israel by looking to the prophets. There are over one hundred clues in scripture.
Daniel 2:44a “And in the days of these kings shall the God of heaven set up a kingdom, which shall never be destroyed: and the kingdom shall not be left to other people”.