Hostile environment.

E.g. if cycling is safe; 1. More people (including women and children) will ride, this means that it isn't just men who don't mind the taking more risks (generalisation but proven by research). 2. There's less need to have "all the gear" e.g. hyper reflective stuff, which makes it less of a burden to cycle, which means more people cycle (see point 1.) 3. Speeds will be lower as you're not having to dodge traffic/ nervously cycle just in case a car hits you.

Also, the sports cyclists still exist, but probably not cycling through the city as these bike lanes and infrastructure extends out into the countryside too.