Even if free means what you posit, it comes to the same: market pressures that make building parking garages so lucrative will provide the need if street parking is replaced by bike lanes. Also, reread the part about how creating a viable cycling path network, which is safe for the cyclist throughout, will attract many more cyclist to the road, as it has in other cities. The current number of cyclists in NYC is not nearly the potential number of cyclists if a good network of paths existed.