Bats, thanks for finding that 1971 Watchtower question, "Can it be stated flatly that only baptized witnesses of Jehovah will survive Armageddon?" Summarizing and commenting on the answer:
Instances where non-baptised JWs might get saved:
- Cases involving minor children living with baptised JWs who aren't old/mature enough to be responsible to Jehovah
- Mentally disabled who don't have the cognative capacity to learn, may survive based on family merit (what happens if they don't have JW family members?)
Otherwsise, a person risks getting killed if they don't get dedicated and baptised. (While they do use scriptures to show the importance of baptism, ultimately when all else fails, they use the logic fallacy of appeal to fear 1 (i.e. you risk getting killed if you don't get baptised, be safe instead of sorry))
Then they say they are aware of hypothetical (as if the caveats they provide aren't hypothetical) "What if..." cases that involve extenuating circumstances (metally disabled people, that sounds extenuating to me). They say that considering these has little point and would amount to just speculation. This means they have just acknowledged that they are speculating as well.
Nevertheless, ultimately Jesus will decide won't he, they reason. They also liken such "what if..." thinking to a person just looking for loopholes so that they don't have to get baptised. The overall context of the article does appear to be geared to a person asking this question that has been around JWs (raised in the truth but not baptised, studied but not baptised, etc).
It really doesn't seem to be answering the question from the perspective of if a person wants to know if ~99% of the world's population will be destroyed at Armageddon (i.e. all people who aren't baptised JWs, or minor childern of JWs, or MRDD people with JW family). Nonetheless, this article does imply such mass killing is to happen. One very telling word they use to show why this is the case is their use of the word "extenuating." This conveys the idea of a small number of exceptions.
In essence the answer they give is the following: Only baptised JWs, and perhaps those with extenuating circumstances, will survive armageddon. Nonetheless if they don't become baptised JWs, the vast majority of humans (man, woman, and child) risk being killed by God.
To me this is still different than saying: We don't believe only JWs will get saved. We don't really know what will happen. It's up to God to read the heart and judge.
1 Bennet, Bo. "Appeal to Fear", Logically Fallacious. 21 Sept. 2012. <http://www.logicallyfallacious.com/index.php/logical-fallacies/32-appeal-to-fear>. I like his example, "If you don’t accept X as true, something terrible will happen to you. Therefore X must be true." Let's substitute with the JW stance, "If you don't accept the need to be a baptised JW, then you risk dying at Armageddon. Therefore the need to be a baptised JW must be ture."