At the time of the return from Babylon, God DID NOT make a "NEW COVENANT" with the Nation Israel.Jacob's trouble from Jeremiah 30 is the Babylonian captivity.
Yet if it is future, which empire will be using Hebrew slave labor?
Speaking of Jacob:
Jeremiah 30:8 For it shall come to pass in that day, saith the Lord of hosts, that I will break his yoke from off thy neck, and will burst thy bonds, and strangers shall no more serve themselves of him:
Anyway there is content in the chapter that sounds useful to Dispensationalist mythology, so to the dispensationalist it must be placed in the future, where flexibility of interpretation abounds.
So it gives birth to the story that modern Israel's actions will lead to the building of a third temple and usher in the Antichrist, who will kill two thirds of the people there.
Yet while believing all this, Dispensationalists support those same actions in any way they can, making excuses for genocides and preemptive wars.
So while making Christianity seem repugnant to everyone else, the dispensationalist also seers his own conscience before God.
Furthermore, Messianic Jewish believers during THE CHURCH AGE historically have NEVER been regathered to THE LAND.
These facts leave you in a very precarious position. Spiritually that is.