Jews need to be encouraged to return to the God of their fathers, the God of their part of the Book, and to find out for themselves from Moses and their own prophets who their Messiah was really supposed to be: their Jewish Messiah who would subsequently be embraced by the Gentiles as well.
Replacement theologians need to do the same thing. Instead of trying to propagate the myth that the God of Israel has abandoned His chosen people for the Gentiles, they need to search out the truth in the prophets as well.
God HASN'T abandoned His chosen people, He is seeking them every second of every day...As Paul does tell us, He gave the Jews of Christ's time the first signs, the first opportunity to recongnize the Messiah...Some did, many didn't. God didn't force anyone (Jew or Gentile) to reject His Christ, they chose to do so on their own. The Gentiles of today are not trying to tell the Jews they have to reject their history, but rather to embrace the promises of the prophets that clearly show Jesus to be The Christ.
God used His prophets to deliver the promises of the coming Christ and yet many choose to explain Christ away as a "good man" of "wise instructor" but not the Messiah. If Jesus is not the Messiah, who possibly could be in this day and age which is one filled with a lack of devotion to God and one where news is shared world wide instantaneously? God promised thru the prophets that the Christ would be a man of little fanfare, a man despised by men and cursed to hang on a tree. Crucifixion is no longer an acceptable method of death, how will this be fulfilled? The list can go on and on about the prophesies of Christ that He has fulfilled that frankly, just can't happen in our world today. God knew the right time to have His Messiah be delivered to His peoople.
I would welcome all those who reject Christ to read the New Testament to see the promises of Christ manifested in it's Holy words. Read and see the promised Messiah literally raising from the pages fulfilling the words of the prophets and coming to us in person 2000+ years ago. Read and see the love of God and His mercy for us by giving us His only Son to be the atoning Sacrifice for the sins of many. The O.T. is flowing with the prophecies about Christ and Christ clearly fulfills them all.
I pray that all peoples of the Earth are brought to Christ Jesus and to know His Love as He brings us to know the Spirit and The Father as Triune God.
Lord Jesus Christ, please bring Your people home to You, bring them to the knowledge of The Way, The Truth, and The Life...
God's blessings to all...
Let me know when you come across a genuine "replacement theologian". I've never met one, myself.