Yes, the entire idea is to refactor our cities and societies so that most people can and do use the low carbon option.
It's not commuting 40Km by bicycle, it's raising the price of gas to the point that people choose to live at a distance where they can bicycle to work. At the same time you need to build housing and bike infrastructure to make sure everyone can have access to it.
Not everyone lives in a city. 'Refactoring' the planet is a pipe dream in the short term. It's not possible in the timeframe being discussed. People in the larger thread suggest that its better to get the dying over with now since it'll happen anyway. When food stops moving, it'll be the cities that fall first. A bicycle won't help.
It's not commuting 40Km by bicycle, it's raising the price of gas to the point that people choose to live at a distance where they can bicycle to work. At the same time you need to build housing and bike infrastructure to make sure everyone can have access to it.