The Church has not permanently replaced Israel and God has a distinct program for Israel and the Church.
The OT promises to Israel have not been transferred to the Church. These promises (which include land, many descendants, and blessings) will be literally fulfilled in the Millennium.
The Davidic Covenant is also fulfilled in the Millennium when Jesus literally rules from Jerusalem (the throne of David).
Just as God is currently focusing his attention on the Church, in the future he will again focus his attention on Israel.