The average Atlantan drives 66 miles per day. A lot of those miles are racked up driving back and forth between city center and the outlying McMansion suburbs.
IMO, that lifestyle borders on being immoral (from an environmental perspective), and is certainly not sustainable.
I agree. People have to rethink how they live entirely. Even if you live in the 'burbs, biking can be a viable alternative in many locations for running errands and getting to commuter/subway stations.
In addition, DC hasn't had too many problems increasing bike infrastructure. Like all major cities, DC is old and lacks room for expanding anything. It just takes some common sense and redesigning with bikes in mind. It's all about re-balancing things. Right now, the scales are tipped far too much towards automobile transportation. That needs to change for environmental and health reasons.