Oh yes, we've discussed it more than once but I keep getting from him, "Look you won't have to put up with this situation--or me, for that matter--much longer. You know how short-lived we are in my family; at 77 I'm on borrowed time. I won't be around that much longer and then you can do whatever the hell you want."
He's in perfectly good health. He is right about his family, though; the longest-lived family member 'till him only lived to 74 and it was said, "Oh, well; we shouldn't be too sad; he had a good long life."

My mother-in-law didn't believe me when I told her one of my great-aunts lived to 102.; "C'mon, now, girl; people don't live that long." Huzz's family are country folk who are almost all heavy cigarette smokers and 100 percent do not trust doctors so most only live to their 60s.
I've heard internet advice that I should push it and threaten divorce if he won't downsize but I've also heard--might've been here on SF, anyway some site--that women who've done that were made to "pay" for it by the husband, him complaining vociferously
every day about it ("I'll never forgive you for making me give up my house!") 'till the day they died. And I don't want to take that chance; if that happens, we'll both be miserable; at least only I'm miserable now.
I've even tried telling him how much harder it'd be for me in this big old place if he dies or goes permanently into skilled nursing first rather than if I were in a managable smaller home or condo or something, but all I ever get back is "You'll figure it out." I've heard a lot of women say that's what their husbands say to them too. Do all these stubborn old men take a class?!
When I told a friend who's been widowed twice--both husbands died suddenly; 1 from an undiagnosed heart problem and the other got sepsis at our local hospital--that he just keeps saying, "You'll figure it out", she said, "Well, I can tell you from first-hand experience that sure, you'd probably manage to 'figure it out' but it would be hell. Take it from me; it's hell."