Seen that too many times, where as one gets older, they get relegated to only one floor of a house. One of my siblings built a house based on some of those, because their spouse wanted that style. They have since bought a house that an elderly relative is living in, with the idea that they eventually move there, back into town (live on acreage in the country currently), and all on one level.
I am the other direction based on my medical issues growing up, and helping with relatives who couldn't walk from Polio and such. It is why (along with the lowered expenses), that I want a monolithic dome.