I'm pretty sure the full time caregiver role was by design, often the youngest daughter. But the way everything worked was different back then and most people got assigned roles in life rather than being able to choose. Being a caretaker back then would have come with a home and board, which was about all most people could hope for at that time. Sometimes we have a similar idea happening now - one child becomes a caretaker and in turn inherits the family home. But too often now I think we have moved towards the idea that you (or more often that someone else) should care for someone out of "love" alone and have forgotten that does not pay the bills.

I think a lot of people's negative attitude towards nursing homes is them mis-attributing their own decining abilities to the place they live, in much the same way some people refuse to go to hospital because "people die in hospitals". Being stuck at home with insufficient support for your needs can be much worse than the institutionalised care of a residential home. Especially in situations where you are expecting other people to juggle full time work with a caring role being in a nursing home can be a much better situation.

There are definitely some people who have good experiences with caring for parents (which will hopefully be my experience!) but that can only happen if it is a free choice, not one forced on someone through guilt or coersion, and not when it leaves the carer with no resources to look after themselves. The "old maids" in the past would have generally gone on to be cared for by someone else in the family, or perhaps entered the church as a nun where they would have been cared for.