Cora was not being indifferent or callous when she stated that The Levinsons are not at fault and have given quite enough to DA,She said,quite truthfully,that they could be fine in a smaller estate.
Matthew has no obligation to hand over his money. I'm sure a way will be found to save DA but,if they lived in a smaller place, they could still employ servants. It would not be a dead end situation.
A program re Highclere Castle said that,in Edwardian Times) 3 maids would share a ghastly room in the eaves(about 5 floors up) They would have much less walking in a smaller place and less floor scrubbing.
I'm rooting for Martha(Shirley),Cora and Branson-more power to them.
Lots of people were uprooted during these times and many had to emigrate.