Majority of America is overweight, staring down at their phones day and night, and dread physical activity. They also like to flex their position and wealth to others, one of the reasons why pickup trucks and big SUVs sell in great numbers. These people are in no hurry to transition to riding bikes.
The only way biking might work is if some popular celebrities on social media or otherwise started doing it, since many Americans just like to imitate what's popular.