Either Paul, in writing Romans 11, is stating facts concerning national political Israel in which he served in the interest of the temple rulers as Saul, or Paul was delusional perhaps as the result of the many beatings and deprivations he endured.There are a number of double entities to consider -
The idea that God has been punishing all the Jews of 50 generations for the sins of one generation (this generation, that perished in AD 70) is repugnant to the God of justice & to the Gospel of the Lord Jesus Christ.
- The descendants of Abraham - believers in the LORD & those who did not believe, both scattered among the Gentiles, believers uniting with believing Gentiles to form the Church of Jesus Christ.
- The Jews of the first century - Jewish leaders who rejected Jesus & Jewish people who received John's baptism & followed Jesus.
- Jews including some Gentiles who welcomed Jesus into Jerusalem & those who rejected him & demanded his death.
- Jews & Proselytes who welcomed the Apostolic Gospel from Pentecost onwards & those who rejected the Gospel & persecuted the Christians.
- Religious Jews who respect the Torah, who are concerned for justice for the Palestinian people & godless Jews who focus on the state of Israel.
- Christians who believe that the Gospel has always been open & free to Jews (and of course to all sinners of all nations) & Christians who believe that the Jews have been excluded from the Gospel until Jesus returns for rapture/tribulation/millennium etc.
The single scheme that is not ultimately racist and biased against Jews, Muslims, Hispanics, whites, blacks, Asians .... is - the Christian Gospel - there is no respect of persons with God.
2 Chr. 19:7 Wherefore now let the fear of the LORD be upon you; take heed and do it: for there is no iniquity with the LORD our God, nor respect of persons, nor taking of gifts.
Romans 2:10 But glory, honour, and peace, to every man that worketh good, to the Jew first, and also to the Gentile: 11 For there is no respect of persons with God.
12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;
Are you really going to attempt to present Romans 2 as discrediting Romans 11 that clearly declares God most certainly has a plan for national/political Israel? Was this not exactly the question Paul presented in the opening verses of Romans 11?
There is a single Biblically accepted view of the future. It is that found from chapter 19 and following in Revelation.