I personally am inconclusive about the great crowd, but I have found many scriptures that address the earthly part and they do not at all agree with what the WT teaches about it. I want your thoughts on this.
First look up Rev 20:7-9. This is AFTER the thousand years have ended and Satan is released. WT teaches that everybody was resurrected and living 1,000 years and perfect, then satan gathers gog and magog, and they surround the good people. That there is no literal camp of the holy ones. And the bad people are killed by fire from heaven. That is what is taught.
Now read the entire chapter of Ez 38 and 39 which detail what exactly happens on this gog and magog war and the REASON for it. To sum it up, Jehovah is against Gog from the land of Magog. That they would in the end go upon this land or country that was brought back and made from peoples scattered. (Israel destroyed by sword in 70 AD and brought back in 1940's, it's people brought back from scattered throughout the earth). In the final part of the days he will have gog attack them and I quote, "FOR THE PURPOSE THAT THE NATIONS MAY KNOW ME WHEN I SANCTIFY MYSELF IN YOU BEFORE THEIR EYES, O GOG." So first question here, if this gog attack is the same as in Revelation, how would the nations not know God/Jehovah?
In vs 18 to 20, it's clear this event will be for the entire world to witness and all will be in fear.
In revelation it says when this army surrounds them, fire comes down from heaven and devours them. What does Ezekiel say will happen?
Ez 38:22 - and a flooding downpour and hailstones, fire and sulphur I shall rain down upon him and upon his bands and upon the many peoples that will be with him. And I shall certainly magnify myself and sanctify myself and make myself known before the eyes of many nations; and they will have to know that I am Jehovah.
What happens after this? Ezekiel 39 shows how Israel will burn fires for 7 years from all the military equipment. And where they will be buried, etc.
What about all the nations, what happens to them?
Zechariah 14 also describes this same event, but also tells what happens after.
Zech 14:1 says he will gather all the nations to war against Jerusalem. His feet will stand on the mountain of olive trees and split that mountain in 2. (what's interesting is here it's saying Jehovah is doing this, but other parts of the bible say it's Jesus doing it). In vs 9 it says Jehovah will become King in vs 9. Vs 12 is the rotting away of ones flesh scourge. Vs 16 to 21 details what happens AFTER. The survivors of the nations who went against Israel must make a yearly pilgrimage to bow down to the King, Jehovah and to celebrate the festival of the booths. Any nations who don't, they will not even get rain upon their land. O and Zech 14:8 describes the living waters, the same as seen from the Revelation vision.
SO................IF...the hope is earthly, the WT isn't teaching what the bible teaches about the earthly hope.