I think the Rich Man and Lazarus parable, from what I've read, and some of my own thoughts on it, stand for this (surely, any wisdom though, comes from the God that is LOVE):
Rich Man = Jews
Lazarus = Gentiles
Within the New Covenant the Gentiles got the riches of the Jews. The Jews were still trying to live in the Old Covenant (aka Hades) and Abraham told them that nothing they could do could get them to God whilst in Hades (aka living in the Old Covenant). It was an impassable gulf. He also told the Rich Man that it wouldn't be any good to tell "his brothers" because they wouldn't believe even if a man rose from the dead (aka Jesus).
Another way of looking at the impassable gulf (which could probably be articulated into my above sentence): it is the stubbornness that God has put upon the Jews, temporarily, to bring in the fullness of the Gentiles. But once the Gentiles have all entered, THEN the impassable gulf will be filled, or done away with, and then the Jews will be able to enter into Abraham's Bosom (which is a symbol for a close relationship with God), and then ALL Israel will be saved (as well as all the Gentiles of course).
Meanwhile, the Jews, or the "Rich Man," suffers from their loss of primary favor from God.