New York City has promised to add concrete barriers to their bike lanes that are currently delineated with paint and plastic posts. Chicago should follow.
A discussion of whether or not "door zone" lanes lanes are terrible yielded an essential truth: To dramatically build bike mode-share, what we need a network of 8-to-80 facilities.
Assuming the bike lanes start functioning as intended, and more people start cycling in them, bringing additional potential customers to the corridor, that should help reassure some of the merchants.
Adding painted Jersey walls to the new Logan lanes would offer real, physical protection for cyclists. That would be an even better tribute to the people who died while biking there.