You are the first and only person that I have ever heard make that bizarre and outrageous claim. Amazing really.
Individuals here freely admit that they are convinced that the New Covenant does not begin until Jesus' return.
This is because they claim the New Covenant was made only with Israel, and they are looking forward to its establishment when the Millennium begins.
You might check with your fellow dispensationalists here on this detail.
One called theDivineWatermark posted a list of possible explanations in this regard that dispensationalists hold, so it is indeed factual that some of them believe this.
And, I see why they believe it, due to the fact that they don't think Israel's promises were generalized to all those in Christ. Because, the wording of the New Covenant specifies that it is to be made with Israel and Judah.
Jeremiah 31:31-34 31 “Behold, the days are coming, declares the Lord, when I will make a new covenant with the house of Israel and the house of Judah, 32 not like the covenant that I made with their fathers on the day when I took them by the hand to bring them out of the land of Egypt, my covenant that they broke, though I was their husband, declares the Lord. 33 For this is the covenant that I will make with the house of Israel after those days, declares the Lord: I will put my law within them, and I will write it on their hearts. And I will be their God, and they shall be my people. 34 And no longer shall each one teach his neighbor and each his brother, saying, ‘Know the Lord,’ for they shall all know me, from the least of them to the greatest, declares the Lord. For I will forgive their iniquity, and I will remember their sin no more.”
(ESV)
Notice that the New Covenant here is made with Israel and Judah.
Since the dispensationalist denies that the promises made to Israel and Judah are generalized to all believers, Jew and Gentile, the consistent dispensationalist would deny that the New Covenant applies to all believers, Jew and Gentile. I believe some will claim that it isn't even in effect yet, and begins at some future point.
Anyways, I realize dispensationalists are not totally consistent with their doctrine, but the consistent ones tend to believe this. And, if they open up the door to this generalization hermeneutic I am speaking about, then they open the door to their entire system collapsing.
Which is precisely what has happened to the possibility of dispensationalism being true in my mind.