Fixies especially seemed like they would usher in more urban cycling (especially with people switching to singlespeed, but keeping the cool look), and messenger culture was a thing. There was no specialized equipment, except for perhaps tight jeans and moustache (optional for women).
However, no matter go interested people are, eventually reality hits you like a truck, or car door as the case may be, and your third bike gets stolen, and you get sick of it.
People would definitely use the infrastructure- there's no shortage of people who like to rides bikes, but are sick of dealing with crazy drivers and potholes and car doors and fedex/prime trucks parked wherever in the middle of the road.
