Did God's people stumble and fall beyond recovery?  Of course not! His purpose was to make his salvation available to the Gentiles, and then the Jews would be jealous and want it for themselves.  Now if the Gentiles were enriched because the Jews turned down God's offer of salvation, think how much greater a blessing the world will share when the Jews finally accept it.

-Romans 11:11-12

But some of these branches from Abraham's tree, some of the Jews, have been broken off. And you Gentiles, who were branches from a wild olive tree, were grafted in.  So now you also receive the blessing God has promised Abraham and his children, sharing in God's rich nourishment of his special olive tree.  But you must be careful not to brag about being grafted in to replace the branches that were broken off.  Remember, you are just a branch, not the root. 

-Romans 11:17-18

For if God is willing to take you who were, by nature, branches from a wild olive tree and graft you into his own good tree─a very unusual thing to do─he will be far more eager to graft the Jews back into the tree where they belong. 

-Romans 11:24

For Christ himself has made peace between us Jews and you Gentiles by making us all one people.  He has broken down the wall of hostility that used to separate us.  By his death he ended the whole system of Jewish law that excluded the Gentiles.  His purpose was to make peace between Jews and Gentiles by creating in himself one new person from the two groups. Together as one body, Christ reconciled both groups to God by means of his death, and our hostility toward each other was put to death.

-Ephesians 2:14-16