This would mean then that the temple of God is St. Peter's Basilica in Vatican Rome. What do you think?
To me this makes sense. Jesus was first for the Jews, and then for the Gentiles. Since the Jews by and large rejected their messiah, the offer of redemption through the Messiah was then offered to the gentiles (whole world). Therefore, since the new covenant isn't just for jews but for the whole world, it would make sense for God to move his City from Jerusalem (the center of Jewish Israel) to Rome, the center of the gentile world.
One final point. "Inscribed on the entrance of St. Peter's Basilica in Rome is
Templum Vaticani (Temple of the Vatican)."
https://pdfs.semanticscholar.org/0763/b9c0498b3f6b35c6f369e7989f791fc7af64.pdf