Lets look a this a bit more obliquely.
If the "Gospel of the Kingdom" was all about living in a paradise Earth, how come the apostles such as Paul never made any mention of such a place?
Now if the "Gospel" is referring to love and forgiveness, which is what Paul taught as "Christ crucified" then I submit that the spread of Christianity throughout the Earth means that the scripture has been fulfilled.
As for JW's, I'm afraid that they missed the boat totally, particularly on the love and forgiveness score. Maybe that's why Friday is so ratty and cantankerous.
Englishman.
Nostalgia isn't what it used to be....