I think most JWs want a Paradise, but don't look forward to the eternal destruction of seven billion people. Perhaps some do...likely Anthony Morris.
I know when I was a JW wrestling with this teaching, praying about it, arguing with God as to whether there could be a better way. I suspect that I was not alone with wrestling with this.
I believe there may be categories:
(1) JWs who want Paradise, but struggle with the death of billions.
(2) JWs who don't really know their own official teachings...they've kind of zoned out at meetings or something. Perhaps they think Armageddon is supposed to do away with murders and rapists, but not all those who are not JW. Or perhaps those who die will get to come back in the resurrection.
(3) Perhaps similar to category 2, JWs who only spout the "outsider teachings" that Watchtower gives to the outside world: God judges, we can't, blah, blah, blah. They are either unaware or consciously or subconsciously sidestepped the real insider teaching.
(4) Maverick JWs who believe their own thing knowingly apart from the insider Watchtower teaching. Technically, this makes them an apostate, but they believe themselves as faithful JWs. Perhaps they think the Governing Body will clarify matters as time goes on.
(5) JWs who believe the official teaching down the line, but it doesn't bother them as long as they make it.