In regards to my OP the fact that fallen angels seem to be prominent throughout the Lords first coming still points to the fact that angels seem to have already been thrown out of their heavenly home.
Both Satan and fallen angels have clearly still been operating in the heavenly realm throughout recorded Biblical history after the events recorded in Genesis chapter 6, and they will continue to do so until the actual timing of the war in the heavenlies during the midway point of Daniel's 70th week (Daniel chapter 9).
For example, in the book of Job, we read:
Job chapter 1
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6] Now there was a day when the sons of God came to present themselves before the LORD, and Satan came also among them.
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7] And the LORD said unto Satan, Whence comest thou? Then Satan answered the LORD, and said, From going to and fro in the earth, and from walking up and down in it.
Again:
Job chapter 2
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1] Again there was a day when the sons of God came to present themselves before the LORD, and Satan came also among them to present himself before the LORD.
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2] And the LORD said unto Satan, From whence comest thou? And Satan answered the LORD, and said, From going to and fro in the earth, and from walking up and down in it.
In both of these instances which occurred long after Genesis chapter 6, "the sons of God" or angels "came to present themselves BEFORE THE LORD, and Satan came also among them to present himself BEFORE THE LORD".
Furthermore, in the prophet Daniel's day, we clearly see a war taking place in the heavenly realm between Gabriel and fallen angels. In fact, Michael the archangel had to come to help Gabriel win that battle:
Daniel chapter 10
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11] And he said unto me, O Daniel, a man greatly beloved, understand the words that I speak unto thee, and stand upright: for unto thee am I now sent. And when he had spoken this word unto me, I stood trembling.
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12] Then said he unto me, Fear not, Daniel: for from the first day that thou didst set thine heart to understand, and to chasten thyself before thy God, thy words were heard, and I am come for thy words.
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13]
But the prince of the kingdom of Persia withstood me one and twenty days: but, lo, Michael, one of the chief princes, came to help me; and I remained there with the kings of Persia.
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14] Now I am come to make thee understand what shall befall thy people in the latter days: for yet the vision is for many days.
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15] And when he had spoken such words unto me, I set my face toward the ground, and I became dumb.
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16] And, behold, one like the similitude of the sons of men touched my lips: then I opened my mouth, and spake, and said unto him that stood before me, O my lord, by the vision my sorrows are turned upon me, and I have retained no strength.
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17] For how can the servant of this my lord talk with this my lord? for as for me, straightway there remained no strength in me, neither is there breath left in me.
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18] Then there came again and touched me one like the appearance of a man, and he strengthened me,
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19] And said, O man greatly beloved, fear not: peace be unto thee, be strong, yea, be strong. And when he had spoken unto me, I was strengthened, and said, Let my lord speak; for thou hast strengthened me.
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20] Then said he, Knowest thou wherefore I come unto thee?
and now will I return to fight with the prince of Persia: and when I am gone forth, lo, the prince of Grecia shall come.
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21]
But I will shew thee that which is noted in the scripture of truth: and there is none that holdeth with me in these things, but Michael your prince.
Even after Christ's resurrection from the dead and ascension back to the Father's right hand in heaven, we are told exactly who we are fighting against:
Ephesians chapter 6
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10] Finally, my brethren, be strong in the Lord, and in the power of his might.
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11] Put on the whole armour of God, that ye may be able to stand against the wiles of the devil.
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12]
For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Our present-day battle is "against spiritual wickedness IN HIGH PLACES" or "in heavenly places".
Satan and his angels have not yet been cast down.
As I said in my initial response, they will be cast down to this earth at the midway point of Daniel's 70th week (Daniel chapter 9). This casting down of Satan and his angels in the spiritual realm will coincide with the antichrist declaring himself to be God from within a coming rebuilt temple in Jerusalem in the natural realm.
Neither of these two events has happened yet.