Turns out that even if you cover people's basic food and shelter, they still are interested in producing stuff -- whether that's art, software, or widgets, many folks still take pride in doing work. They may not work 40 hours, but I guarantee you people would still be working.

Edit: Also, providing social housing, universal health care, and basic food assistance isn't communism. France isn't a communist country, and yet they have access to those things. It's not a boolean flip between capitalism and communism -- we can have elements of both and tune it to what we'd like.