Are you suggesting that God did intend for the old covenant to be permanent, or we can't know because there are no definitive statements in the Bible on the subject?
I don’t pretend to be so all knowing that I can state as FACT what GOD intended.
All I know is that God punished the Israelites for their idolatry. Yet he gave them the promised land.
God sent his Son to SAVE the Gentiles from their idolatry.
However, Christians are making the same mistakes the Jews made, worshiping the things of the EARTH. Not a golden bull, but just as offensive in Gods eyes. HE alone is to be worshiped.
To believe that Jews will somehow be abandoned by GOD is irrational. HE never has.
Christians are becoming the target of evil from the one third of the world bringing death and destruction.
We can only pray that GOD will show us the same mercy he gave to the Jews.