We would expect parcel prices to increase with upzoing - land becomes more valuable if more people are permitted to enjoy using it. That's the behavior that encourages developers to make multi-family housing.
Not everybody wants to get rich. Some people, especially the old, just want to stay in a familiar place. If you change that place, it is no longer familiar. Older people often struggle with change. People with memory problems can often get by for much longer if nothing much changes. If you make changes all around them, they might need to go into a nursing home and then struggle every day in the unfamiliar situation.