I agree with your analysis but I dont see that how ‘our’ social setup can help taking care of these issues. See, I am not mixing capitalism with social setup here. Most of things that you discussed are the result of the way health industry operates and has nothing to do with not having kids living with them. You still need a robot sensor when Kids go to job and grand kids are in school. Also, the way USA job market is, there is no gurantee that you will get a job in the same city where your parents live. Then what we gonna do? Drag the parents with us from city to city?
Its good to know that the family is there when you need them but the independent lifestyle aspect is always a priority, just like MO3 mentioned.