If me telling her would have ended this marriage then would it have lasted if some other big disagreement or problem came our way?
I think about this a lot. I think part of the problem, though, is that objection to the cult isn't seen as just any old disagreement or problem. The cult is the 3rd strand of the 3-fold cord of your marriage, and they're indoctrinated to believe that if that goes away the marriage is doomed and it becomes a self-fullfilling prophecy.
Flipping El - I don't have a lot of sage advice for you, since I'm not in any better of a situation, but I would suggest that you do at least have one advantage - you talk about it. My wife knows there's something wrong, and I've made some statements here and there about things that I object to, but she doesn't ask me anything about it. I think you may be closer than you think to reaching her if she at least is asking you what's up. One suggestion that I'd give would be to get some sort of commitment out of her prior to discussing it further. When she asks you what's wrong, ask her "if we talk about it, will you promise that you'll try to see it from my point of view without judging or making assumptions?" or maybe ask that she make an effort not to be upset that you've expressed an honest feeling.
In some ways I envy you that you talk about it at all. Because I always knew there was something wrong with JWism (and religion in general) I never really wanted to talk about it at all - it was too uncomfortable because of my many doubts. Now we're at a point where we just don't talk about it and the only JW activity we do together is sit at the kingdom hall. There's so much unspoken tension that I don't even know where to begin in addressing it. If i could get her to ask me what's wrong I feel like there'd at least be some relief. What's more, I know she's constructing her own little story about why I'm doing what I am and this imaginary story is going to do nothing but cast me in a bad light.
Anyways, please keep us updated. Hearing stories like yours is about the only source of hope that I have. Even if you don't make progress or hit a snag, it helps just to know other people are going through the same problems. Thanks for sharing.
Edited to add -
Londo - I've often thought the very same thing about Hassan's methods. When you've been born-in and married for 10 years, even asking a question that betrays some doubt is immediately viewed with suspicion. Since questions are the main way he says to get someone thinking, I just don't know what to do...