Hey, creator of Sonar here! We are planning on supporting project boards in the future, but aren't sure of a timeline yet — still gauging interest in the feature :).
Based on anecdotal evidence, I've found that almost none of my non-wealthy family and friends like driving. They all drive fairly average cars (Honda Civic, old minivan, etc) on fairly average commutes between home/work/school/etc.
For them, driving is just a means to an end. If there was something better that was cheaper and fulfilled their needs, I think they'd sell their cars in a heartbeat.
That being said, I do love driving, and you're gonna have to pry my car from my cold dead hands :).
twitter.com/daveymcgav