I very highly doubt we are going to get there until electric bikes (even if electric-assisted bikes) are the standard and affordable. Bikes might be great for most folks on flat land, but mountains are an uphill battle (pun intended) for anyone starting out as an adult and simply put, not everyone is going to do such a thing.

Additionally, most places I've lived didn't have bike racks (small to medium sized towns in Indiana), nor did a lot of workplaces put much money into employee break rooms. You can change out of those wet clothes in the public restroom, but it would be unacceptable to show up wet with sweat.

Cars just require parking spaces, and employers don't have to provide those.