The restoration that Ezekiel is fortelling has already occured before the first coming. That second temple was destroyed utterly in 70AD, 1.1 million jews perished, and most the rest were sold into slavery for a pittance, Israel was once again grafted out and her covenant with God ended.
Under the new covenant salvation is still available to all, but is no longer granted to any one nation, but to all of every nation.
Under the new covenant salvation is now available to all, and is no longer granted to just one nation, but to all of every nation.
This goes without saying. We are under Grace now instead of the Law.
However, this does not mean that God has not kept his covenant with Jacob. That covenant still stands.
Ezekiel 37 being interpreted as having already occurred makes no sense. I have noticed CI types who insist that this is the case. Quite the contrary. Look at the verses about the "sticks." Israel, Judea becoming one again, and being repopulated from the Children of Jacob that were dispersed throughout the entire world.