The document discusses the need for and viability of 100G networking. It outlines three key reasons for 100G adoption: meeting exponential capacity growth, enabling new services, and allowing for efficient network evolution. While fiber impairments pose challenges, modulation techniques and standards development are making 100G networking possible without wholesale network replacement. Recent demonstrations show 100G's technical feasibility, and most networks will require 100G by 2012 as 10G and 40G capacities are saturated.