Crystal City is a nightmare from a commuting perspective only if you're dead set on driving, and even then it depends very much on where you're coming from. I've lived on the Yellow/Blue lines south of DCA, now I'm in west Arlington, and I've done plenty of commuting along that corridor by bus/train/bike/car (Mt. Vernon/4 mile run/ W &OD trails for biking/running as a commute is very effective).
Also there's a relatively high concentration of metro stops as is for a section that's not urban/DC core, and Potomac Yard is finally coming in in a couple years as well. Plus a pretty high commercial vacancy and a bit of marginal land that can still be developed. I mean, the dream would be they come in there and somehow spur additional transit down Columbia Pike, but that's probably a bit too much to hope for.
It's also already not easy at all to buy a home there (speaking as someone who bought a place in Arlington a few months ago), so it must not be too awful to live there.