When Jesus is asked about the fall of Jerusalem and the time of his return by his disciples, Jesus talks about both. He says that there will be wars and catastrophes, persecutions, and betrayals, but that is not the end. Then He tells of Jerusalem's destruction, and then He speaks about the end times before his Second Coming.
Luke 21:24-28 King James Version (KJV)
24 And they shall fall by the edge of the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
26 Men's hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.
27 And then shall they see the Son of man coming in a cloud with power and great glory.
28 And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.
I came across a question on this issue of the "Times of the Gentiles" and looked up to see what I could find, and found very little. No one seems to have a full grasp on it although basically it appears mostly fall into a prophetic timeline. Here is one timeline...
"The same Jerusalem which "was compassed with armies" in A.D. 66 (Luke 21: 20), which was
laid "even with the ground" along with her "children within" (Luke 19: 43-44), and whose
people (the Jews) were "led away captive into all nations" in A.D. 70 (Luke 21: 24a), is the same
Jerusalem that would be "trodden down of the Gentiles (Gr. - ethnē - "nations"), until the times
of the Gentiles (nations) be fulfilled" (Luke 21:24b). Historically, the capture and destruction of
the city by the Romans in A.D. 70 began a centuries long "trodding down" of it by the "ethnē" (nations). This non-Jewish governmental domination of Old Jerusalem would continue throughout this allotted time period until the Jewish people would once again gain governmental control of the city."
.....http://www.adventistlaymen.com/WWN%20ARTICLES%20IOWA/WWN%20IOWA_10(16)_11(16).pdf
The problem is that Jews have not gotten complete governmental control of Jerusalem until they have the authority to rebuild the Temple on the Temple Mount. And that they will never have, since the Temple Mount is the site of the al-Aqsa mosque and constitute one of the three holiest shrines in the Muslim world. The Jews may manage the city, but it will never really belong to them until they can rebuild the Temple, which is not possible. But we see a 'New Jerusalem' in scripture..
Revelation 3:12
Him that overcometh will I make a pillar in the temple of my God, and he shall go no more out: and I will write upon him the name of my God, and the name of the city of my God, which is
new Jerusalem, which cometh down out of heaven from my God: and I will write upon him my new name.
Revelation 21:2
And I John saw the holy city,
new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.
The destruction of Jerusalem and its Temple occurred because of disobedience of the Jews, and to be restored would require repentance and obedience. Which the Jews, in their blind rejection of Christ, stubbornly refuse. So scripture shows that God will have to clean the slate of the literal Jerusalem and bring in and replace it with a new one coming from heaven..