Alternatively, if we consider prophecy focuses on the cross and the timeframe after the cross -- that same generation -- we might consider what Adam Clarke said:
Zec 14:4
And his feet shall stand - He shall appear in full possession of the place, as a mighty conqueror.
And the mount of Olives shall cleave - God shall display his miraculous power as fully in the final restoration of the Jews, as he did when he divided the Red Sea that their forefathers might pass through dry-shod. Some refer this to the destruction of the city by the Romans. It was on the mount of Olives that Titus posted his army to batter Jerusalem. Here the tenth legion that came to him from Jericho was placed. Joseph. De Bello, lib. 6 c. 3. It was from this mountain that our Lord beheld Jerusalem, and predicted its future destruction, Luk_19:41, with Mat_24:23; and it was from this mountain that he ascended to heaven, (Act_1:12), utterly leaving an ungrateful and condemned city.
And half of the mountain shall remove - I really think that these words refer to the lines of circumvallation, to intrenchments, redoubts, etc., which the Romans made while carrying on the siege of this city; and particularly the lines or trenches which the army made on Mount Olivet itself.
The key is that rivers of living water would flow from this rent mountain. Jesus plainly said the rivers of living water are the baptism of the Holy Ghost.
Zechariah 14:8-9 KJV And it shall be in that day, that living waters shall go out from Jerusalem; half of them toward the former sea, and half of them toward the hinder sea: in summer and in winter shall it be. (9) And the LORD shall be king over all the earth: in that day shall there be one LORD, and his name one.
John 4:14 KJV But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life.
In Jerusalem, Jesus said these words:
John 7:37-39 KJV In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink. (38) He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water. (39) (But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)
Let scripture interpret scripture.
Jesus is seated right now over all names and powers in this age and the age to come. When the resurrection occurs, sin will not so much as exist in mankind any more, for sinners will have been removed into the lake of fire and death shall no more affect us due to our bodies having been changed to immortal bodies.