In Boston there's both a will and a way. I haven't owned a car for as long as I've lived here, and the bike lanes are so, so much better now than when I first arrived. Neighboring Cambridge now has laws on the books requiring bike lanes to be added any time that a road is rebuilt. The new light-rail extension through Somerville added a bike path alongside most of its length, connecting the paths along the downtown riverside to the Minuteman bikeway that runs 15 miles out to Bedford.
It can be done. But people have to organize and give a fuck.