This pastor was both right and wrong!
He was correct that the Covenant God made with Israel in the Sinai was a conditional covenant - and the condition was obedience to the law - which Israel obviously broke.
Most of Israel, as it was at that time (twelve tribes), is lost - the Northern Kingdom went into exile and never returned as a discrete national unit. Descendants of those people are found all across the Middle East today.
The Kingdom of Judah (tribe of Judah as well as parts of the tribes of Levi and Benjamin) also was given up into captivity - but at least a remnant of those did return and continue as a discrete ethnic unit to this day - Jews!
There is no doubt that, as a discrete ethnic unit, the Jews are currently in rebellion against God. After all, they reject the New Covenant. Obviously, all through history (New covenant history that is) there have been individual exceptions.
As individuals God has definitely not abandoned anyone who is a Jew. The promise, and offer, of salvation is open to all individuals regardless of ethnicity. This is made VERY clear in the New Testament!
However, it really does appear that God does have a role for Israel and has not abandoned them in an ethnic national sense.
This will not be on the basis of the Mosaic covenant however - the ball-game there has been irrevocably lost!
No, the promises go back further to the Abrahamic covenant, which is an unconditional covenant, (in fact the New covenant has its conceptual roots in the Abrahamic covenant) and it will be on that basis that God will honour His commitment to Israel.
There are individuals on this site who understand their eschatology better than I who can expand on the fact that Israel has not been ultimately abandoned by God.