OK I have read it again and it is still part of the prophecy of those days. The captivity would be long and they were to build houses. Their current troubles were Jacob's trouble but the Lord would bring them back from captivity. We know, like Daniel, from Jeremiah that the captivity would be 70 years.
Please show me where this prophecy jumps to the future.
Jer 29:28 For therefore he sent unto us in Babylon, saying, This captivity is long: build ye houses, and dwell in them; and plant gardens, and eat the fruit of them.
29 And Zephaniah the priest read this letter in the ears of Jeremiah the prophet.
30 Then came the word of the LORD unto Jeremiah, saying,
31 Send to all them of the captivity, saying, Thus saith the LORD concerning Shemaiah the Nehelamite; Because that Shemaiah hath prophesied unto you, and I sent him not, and he caused you to trust in a lie:
32 Therefore thus saith the LORD; Behold, I will punish Shemaiah the Nehelamite, and his seed: he shall not have a man to dwell among this people; neither shall he behold the good that I will do for my people, saith the LORD; because he hath taught rebellion against the LORD.
1 ¶ The word that came to Jeremiah from the LORD, saying,
2 Thus speaketh the LORD God of Israel, saying, Write thee all the words that I have spoken unto thee in a book.
3 For, lo, the days come, saith the LORD, that I will bring again the captivity of my people Israel and Judah, saith the LORD: and I will cause them to return to the land that I gave to their fathers, and they shall possess it.
4 And these are the words that the LORD spake concerning Israel and concerning Judah.
5 For thus saith the LORD; We have heard a voice of trembling, of fear, and not of peace.
6 Ask ye now, and see whether a man doth travail with child? wherefore do I see every man with his hands on his loins, as a woman in travail, and all faces are turned into paleness?
7 Alas! for that day is great, so that none is like it: it is even the time of Jacob’s trouble; but he shall be saved out of it.
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:9 But they shall serve the LORD their God, and David their king, whom I will raise up unto them. 10 ¶ Therefore fear thou not, O my servant Jacob, saith the LORD; neither be dismayed, O Israel: for, lo, I will save thee from afar, and thy seed from the land of their captivity; and Jacob shall return, and shall be in rest, and be quiet, and none shall make him afraid.
It seems I didn't post the above but since you have posted further, very imaginative I will add:
I see David being raised as the Lord Jesus, the Son of David, and many Jews ended up serving him.