Israel has been disobedient and rebellious, and in some respects was cast aside when the Gospel was given to the Gentiles and the Jews didn't believe. But that does not mean God is done with Israel. As the Gentiles were grafted into the Jewish olive tree, so too will the Jews be grafted back in at some time in the future. Israel is still loved and chosen by God as His people. What God promised toward Israel in the Old Testament is still valid; He never goes back on His promises.