If we could magically re-do all of the existing infrastructure overnight, then that would be a good solution. But since it's impossible to re-build all roads to

If we could magically re-do all of the existing infrastructure overnight, then that would be a good solution. But since it's impossible to re-build all roads to have dedicated bike lanes, cyclists will have to use the road at some point. And once there is the precedent that cyclists ride only in dedicated bike lanes, then you've limited the area that cyclists can ride to dense, affluent areas that have the demand and money for dedicated bike lanes.