A good thread. Just a couple of quick thoughts to throw in.
Firstly, when we learn from the Bible what it teaches about its own form, or its own meaning, we will realise that Adam and Eve were not two people, but were symbolic of the origins of humankind. The question of whether these two so-called individuals were intended to live forever just does not arise.
Confession,
13 But there are new heavens and a new earth that we are awaiting according to his promise, and in these righteousness is to dwell.
Not sure what you mean to say by quoting that scripture. For me it is confirmation that there will be no material earth. Like most of scriptures this is all symbolic not literal. It is clear to me that there will not be any earthly materialistic everlasting life, nor should such a materialistic form of spirituality be something any Christian would aspire to. Paul puts it bluntly "flesh and blood cannot inherit the kingdom of God" (1 Cor 15:50)
A new heaven and a new earth - a new cosmos will come into being as the physical passes away? The hope for eternal life is hope for life in the presence of the eternal God. The truth is that the fundamental reality, from which all else springs, is the reality of spirit. God is spirit (John 4:24). The JW vision is a very limited one, and a betrayal of what the Bible teaches. A tragically restricted view of the unlimitless love of God. It sadly appeals to the material desires of humankind, who can't let go of the physical. In my view JWs are a materialistic and worldly people.