Paradise on Earth ( the New Earth under God and Christ) is a very old teaching, it was the "divine reward", the final stage of human development after all wrongs were set right, it is Life AFTER life after death.
And there is nothing wrong with that kind of hope and those kinds of dreams, IF they are for ALL people, like Peter said " God wants ALL to be saved and to lose no one".
For the JW's it seems some sort of surreal world where, like you said, they are reward for preaching the teachings of the WT.
I have never been a big fan of the "end of the world, non-believers die, believers inhert paradice on Earth" scenario.
It's almost like rejoicing in the destruction of others, something quite contrary to the teachings of Christ.
Revelations is a book full of imagery and symbolisims and to be selective in what we choose to see as literal and what we choose to see as symbolic is always tricky and always a guess.