They cannot see that "The time IS at hand," and "ALL the sayings of this book" happen "quickly" in the lives of those who know that they must experience every seal, trumpet and plague within themselves; in other words "ALL the sayings of the prophecy of this book." Even now, as it has been for the past 2000 years, all those who understand what is meant by "keeping the sayings of the prophecy of this book" experience "ALL of this book."
The "book" of Revelation is composed - in part - of seven letters to seven specific, historical churches in western Turkey that were experiencing many of the same issues Paul addressed in his letters, not the least of which were the eating of meat offered to idols and false apostleship.
Any attempt to "spiritualize" the historicity of these churches and their unique problems destroys any rational interpretive foundation we have for understanding this book.
Obviously, therefore, I completely disagree with your assertion that we can even keep any of the prophecies of this book 2,000 years later, as it has all been fulfilled, just as was recorded in the first and last chapters:
The Revelation of Jesus Christ, which God gave Him to show to His bond-servants, the
things which must soon take place; and He sent and communicated
it by His angel to His bond-servant John, who testified to the word of God and to the testimony of Jesus Christ,
even to all that he saw.
Blessed is he who reads and those who hear the words of the prophecy, and heed the things which are written in it;
for the time is near. Revelation 1:1-3 (NASB)
And he said to me, "These words are faithful and true"; and the Lord, the God of the spirits of the prophets, sent His angel to show to His bond-servants
the things which must soon take place. Revelation 22:6 (NASB)
And he *said to me, "Do not seal up the words of the prophecy of this book,
for the time is near.
Revelation 22:10 (NASB)
"Soon" and "near" to them 2,000 years ago cannot possibly also mean "soon" and "near" to us 2,000 years later, or the words "soon" and "near" have no meaning whatsoever!
These words - so important to John that he began and concluded the book with them - are the very bedrock upon which any interpretation of Revelation must be founded, or there is no hope of understanding any of it at all!