Like we've discussed more than once, when a revelation from God is received, the soon may be according to God's time and not man's. For example,
Revelation 12;12
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.
The devil has come down and been down on this earth for nearly six thousand years. But in the overall scheme of eternity, a short time can be the entire time of the earth's temporal existence in the revelations of God. So I really don't buy your rationalization. Also we have spoke previously about how the generation in the days of Jesus may not have passed away yet because of what Jesus told them:
28 Verily I say unto you, There be some standing here, which shall not taste of death, till they see the Son of man coming in his kingdom.
1 And he said unto them, Verily I say unto you, That there be some of them that stand here, which shall not taste of death, till they have seen the kingdom of God come with power.
So I don't see the generation Jesus was speaking to all passing away until he comes again in all his kingdom and glory. Case in point is John the Beloved or John the Revelator dead? Jesus told Peter that John would tarry till Jesus would come again:
John 21:20-23
20 Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord, which is he that betrayeth thee?
21 Peter seeing him saith to Jesus, Lord, and what shall this man do?
22 Jesus saith unto him, If I will that he tarry till I come, what is that to thee?
follow thou me.
23 Then went this saying abroad among the brethren, that that disciple should not die: yet Jesus said not unto him, He shall not die; but, If I will that he tarry till I come, what is that to thee?
John may yet die, but he is tarrying upon the earth up until the second coming of Christ when he will come in the power of his kingdom and glory. Some believe that John may be one of the two witnesses mentioned in Revelation 11 who will lose his life fighting in the great battle just before the Lord sets his foot again upon the Mount of Olives.