Baconyum - I think it's more that older people expected one of them being alone after the other dying, and for one to be ill at the end for a year at most, but not the potential decades worth of care home fees, that's a relatively new experience (particularly as 20 years ago, the NHS still had dementia wards that were free at the point of use, if you wanted to go in a care home, that was the 'private' option, there was a free state one until relatively recently). These schemes do seem to be created on the assumption you will be able to live independently until death of one partner, that while care fees might be needed to be paid, it's on the assumption it's for the 'surviving partner' - the other one having done the care for the first.
These complex situations relating to long term care are relatively new with technology keeping people alive later so more are going to get this slow death conditions. The baby boomer generation are beinging to plan for care fees and it not being 6 months max, but potentially years. The generation before didn't expect that to happen.
This couple do seem to have been feckless with their approach to their home as a money bank, but they do also seem to have expected this to be a mess they made that their DCs had to fix/sort out after death, not a problem they would have to deal with themselves. (the fact their DCs are angry about it suggests they hid what they were doing from them and planned to let them find out after they'd died).