This is simply false. Most people absolutely can use a bike. Maybe not for every possible trip, but for many of them, yes. Just look at the bike rate in the Netherlands, if you don't believe me.

There are a variety of possible modes available, and they can be mixed and matched as people need and want. Driving to a suburban park and ride transit station, taking the train into the city, and then using bike share to get to your final destination, is a perfectly sensible thing.