Living with less, simplifying, downsizing--call it what you will--is not for everyone. Let's face it, there are times in our life that demand we have a full house.
For example, children have a lot of stuff: toys, books, art, papers are a part of raising children and it's not practical to consider downsizing. Newlyweds have a lot of stuff: setting up house is an expensive endeavor and shower and wedding gifts take up a lot of space. People who work at home also need a lot of stuff: supplies, computers, fax machines, copiers are a necessary part of running a business.
But living with less is working for me. It has been liberating to unburden myself of the excess in my life. I love the sense of order and calm in my home, and knowing exactly what I have, and exactly where I can find something if I need it.