Strange how some here use the 'tactic' of getting off the Thread subject with starting debates in other areas.
Doing that suggests an attempt to shut down the subject of the thread, don't you think?
So... back to the Thread subject...
The below "prince of this world" is about Satan, the devil, that old serpent, the dragon, for he has many titles in God's Word. Notice Jesus said the below to His disciples just prior to His being delivered up to be crucified. We know He was not talking about the time of Lucifer's original fall, because at this point what He said below was at Jesus' 1st coming, a long...... time after Lucifer had first rebelled and fell as lightning to the earth.
And we know wherever the devil is cast out of, it didn't happen during Christ's Ministry either. Neither has the 'literal' judgment of this world happened yet either, for that's is set start on the day of Jesus' future return when He will assign the goats on the left and His sheep on the right.
John 12:31
31 Now is the judgment of this world: now shall the prince of this world be cast out.
KJV
Then in the later John 14:30 verse, Jesus said the "prince of this world cometh", meaning the devil.
John 14:30
30 Hereafter I will not talk much with you: for the prince of this world cometh, and hath nothing in Me.
KJV
The above casting out event supposedly being about the time of Christ's crucifixion when that prince is cast out seems perfectly logical if one reads The Gospel of John and then closes the rest of The New Testament.
If it weren't for other Bible Scripture given later by Lord Jesus to Apostle John in His Book of Revelation, one could leave this matter there at The Gospel of John.
Rev 12:7-12
7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
8 And prevailed not; neither was their place found any more in heaven.
We know for sure this particular casting out of heaven of Satan and his host did not happen at his original fall either, nor at the time of the cross, which a later verse will reveal. What this does is throw a monkey wrench into the interpretation that the casting out of John 12:31 happened at the time of the crucifixion.
9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
10 And I heard a loud voice saying in heaven, "Now is come salvation, and strength, and the kingdom of our God, and the power of His Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.
When Satan is cast out of heaven with his angels, down to this earth, it will be then... that this will be said. And we easily know that "... salvation, and strength, and the kingdom of our God, and the power of His Christ..." did NOT happen at the devil's original fall. Even per the Book of Job the devil is shown free to roam both heaven and earth at will. At this point towards the end of this world, after that war in heaven happens, the devil and his angels will no longer be allowed in heaven, period. This is why the above verse mentions about the devil no longer being able to accuse us before God's Throne, like he did per the Book of Job.
11 And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
That above verse is a direct link to those delivered up at the end per Mark 13. It's about the event of the 5th Seal of Revelation 6. That is yet another marker here to show this time of casting out after the war in heaven with Archangel Michael is to happen near the end of this world, in the generation of Christ's future return.
12 Therefore rejoice, ye heavens, and ye that dwell in them. Woe to the inhabiters of the earth and of the sea! for the devil is come down unto you, having great wrath, because he knoweth that he hath but a short time.
KJV
That "short time" is the "great tribulation" period. It is to last "five months", as Lord Jesus said He shortened it for His elect's sake.
Lord Jesus said in these last days we'd see signs in the heavens about these things...
Luke 21:25-26
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.
KJV
Those signs evidently will involve the "beginning of sorrows" and carry all the way up to Jesus' 2nd coming on the last day of this world. Revelation 6 on the start of the 6th Seal mentions the stars of heaven falling as "untimely figs", which is about the idea of the winter fig that grows in the winter and falls off early in the spring. Stars is used as symbol in Revelation for angels (Rev.1:20; Rev.12:4).