Dear frizzywhiskers,
I feel for you on this one. My DH and I are in a very similar situation. We have an expensive house in an expensive city and my husband has the golden handcuffs. We haven't solved it yet, but maybe it will help to hear how we are trying to deal with it...
Our situation is slightly different in that the salaries are even more unbalanced. I love what I do, but make literally 1/10 of what he makes. I have thought and suggested to him that I look for a higher paying job, which would mean both of us are miserable. If I managed to get a high enough paying job that could cover our expenses, then he could quit, but it would still be a fraction of what he is currently making, and I would be stuck in it for much longer before we could be FI. He says he can't leave his current job because he is making a lot of money at it, and if he leaves he will be doing the same thing for much less, if he could even manage to find work at all. He also comes home exhausted every night and just wants to watch TV. His job is a huge drain on him, physically and emotionally. IF he can hang in for just 3 more years then we will be FI on paper, but three years at being miserable and stressed out every day might not be worth it. I am worried for his health, and we have a deal that if it ever starts to effect him physically then he has to quit or take a stress leave.
Sometimes I wonder if it's the unknown that scares him. Quitting a high paying job for who knows what is really frightening. I believe he has accepted this situation because of this fear. We've talked about the dozens of alternatives -- selling the house and downsizing (which, like you say, is hard to do in Canada. For us it would mean living in a condo, and neither of us trust the condo market right now, so it doesn't seem like a wise move... or moving to the 'burbs, which my husband refuses to do.)
All you can do is be supportive. In the end, it is his choice to make. You've provided alternative situations. Sometimes I wonder if my DH just lacks vision -- I can envision all sorts of alternative realities, but for him, living in a business world where people save tens of millions before they retire with multiple homes in fancy locations, it probably really scares him to make any sort of sudden leap. We are already oddballs among his peers because we live the way we do. We don't play golf, or drive nice cars, or travel very much. (Which is fine -- he doesn't feel any pressure to do this, but it does make me realize that his work world has a culture that makes it difficult to envision something that, for him, would be so radically different as downsizing to a condo or the suburbs and living on a budget.) I can try to strengthen these alternatives but it is up to him to accept this vision as an option.
So currently he is succumbing to the fact that he will keep his job until they let him go or until we meet some magical number and can be FI. I also worry that reaching this number won't be enough of a reason for him to leave... I can see him having OMY syndrome, even when we reach the number that we've talked about.
To release stress it's SUPER important to eat well and exercise, and he has finally realized this. He's cut out caffeine and sugar, and tries to go for a run or do a workout video a couple times a week. He feels the difference when he does this, so that's the main thing.
We have friends who've switched careers in their 40s and it's taken them about a year for them to decompress and figure out what to do next. I fully expect this to be the case for my husband. The more stressful and draining the career, the longer it will take to figure it all out. I know this scares my husband as well, because right now he can't even think about the 'what next,' and being unemployed for so long will stress him out as well. He has to reach a point where he can actually accept this idea too -- that it's ok to not be working for a while, that he will eventually figure out what to do next, though I can totally see him sitting on the couch for an entire year watching sports! I have to learn to be OK with that possibility, too. It all takes time.
I'm very fortunate in that I know what I want to do with my life and I am already doing it. FI wouldn't even concern me if it weren't for the fact that my husband hates his job. But I'm doing what I can to facilitate the next stage -- by offering alternative visions, by being OK with whatever he needs to do but nudging him to quit, by keeping costs down so that I'm not a super spendy extravagant wife that he feels the need to support, etc. I feel like that's all I can do.
Please keep me posted, I would love to know how your situation develops. It's really hard to see the one you love be miserable day after day.