There's only so much trade off one can reasonably make between accumulating enough and working forever.
We bought LTC insurance for my husband (I didn't qualify at any reasonable rate) and I'm planning on accumulating 250-300K for this purpose for myself. Beyond that, broadly, we will spend down our estate until it's gone and then hopefully qualify for Medicaid.
In terms of actual variables, there are so many possible complicating factors that it's hard to plan much beyond that. Some of the crucial ones are e.g., when and whether to buy into a continuing care community, which state we end up in (Medicaid rules vary by state and there are big differences in how states 'fill in' care gaps left in their Medicaid systems), and (most vitally) whether one of us needs long term care for an extended period of time when the other does not (since the cost of care of the sick spouse can quickly and completely bankrupt the nonsick spouse; in this case, we would likely try to divorce to protect assets of non-sick spouse.
But yeah, it can be ruinously expensive. My dad refused to get LTC insurance and was certain he would die suddenly and not need care (and he repeatedly emphasized that he absolutely under no circumstances wanted to go to a nursing home, that he'd rather go to a state that allowed euthanasia). This all seemed fine in the abstract even 15 years ago, when he and his wife had an estate worth about 2.5 million.
Then they separated, he spent a mass of money on professional rehab, used a bunch of his cash to buy additional property (an emotional desire that I understand but is biting him in the ass now), and developed dementia and needs 24 hour care (at home), which completely aside from the incredible difficulty of finding the reliable help, is costing about 15K per MONTH (he has regular bills on top of that). So he will be totally out of cash in a little over a year, though he could easily live another 5 years at least. So, despite his lifelong repeatedly emphasized wishes, he missed the window to do euthanasia and he's likely going to a nursing home in a year or so. ETA: And his (ex)wife had to legally divorce him instead of just the legal separation, to protect herself from financial ruin.
It's not fun, and these kind of situations are common (esp in my family, where the people who have lived to be old enough to go to a nursing home at all mostly have ended up living in them for >3 years...considerably longer in some cases).