The text does not say that Israel cannot inherit the Kingdom of God in the same level with Christians, it says that people, refusing the new covenant are blinded by tradition instead of looking to God. That is after all what held many Jews back from recognizing the Messiah when he was among them. Those who hold that their traditions have as much authority as the word of God itself. And those traditions abound, not only in Judaism but in much of Christianity itself.
Just as today you in Israel, divide the population into two segments, the Jews and the Israelis, and one can be an Israeli without being a Jew, because Jews are a special breed apart. So does Paul divide Judaism into two parts, those who welcome the New Covenant and the Messiah and those who cannot accept the New Covenant because tradition and their pet interpretation of the Law is more valuable than the evidence before them.
So if you somehow feel left out here, it is not because you are Jewish.
Superior but not separate. There is a clear distinction here. All those who willingly traverse to the New Covenant do not lose anything and those that remain behind continue to practice the Old Covenant and will continue to do so until God decides otherwise. They have an important part to play in the foundation of the Millennium reign of the Messiah.
No not condemned, God has not abandoned them, their existence is part of Gods plan and God will use them yet to further that plan. That means that they will indeed see those promises made to them by God bear fruit.
Actually no, if one pays careful attention to the bible, the Jews will be uniquely positioned as the priesthood within the Millennial reign of the Messiah. The priesthood referred to by the church only assumes what has already been given to Israel as promise. Thus we are all priests and Kings with the Messiah, because that is what the New covenant gives us all, but we are not a formal priesthood, which is a position that will be taken uniquely by the Jewish people.
Actually, that eldest son is a metaphor for yourself... Who does this little upstart think he is, coming here and replacing me?
We the gentiles are adopted members of the family, we may have the same rights as any other son of that family, but we are adopted, not born into the family. we could not replace you even if we wanted to.