I think she has it right. But maybe for the wrong reasons.
Dementia patients do block beds, only perhaps because the care they need elsewhere isn't available.
In all honesty I would not want to have dementia. To forget everything of what you are, why you are and how you came to be who you are. I can say with my hand on my my heart that I would rather be dead than be a non person and to put my family through that.
It is uncomfortable to say it, it is uncomfortable to hear or read it but just because it is uncomfortable doesn't make it any less true.