Within a few years service providers are going to have to provision customers on a temporary basis with capacity exceeding the entire resources of their networks today. We don't think so. The metropolitan network of the future will be DWDM, and will provide bandwidth switching in the optical layer. At least one Ethernet prophet reluctantly concedes that many service providers are singularly unreceptive to calls to arms in support of an Ethernet takeover. But you can't go in slamming ATM or circuit or frame and necessarily expect to make the sale.
Service providers have a comfort level with the older technologies.
People in the manufacturing sector tend to view these protocols in the context of a religious war, but that doesn't play in the marketplace. You succeed today by supporting all protocols, not by betting on one. That both the efficiency argument and the price arguments in favor of universal Ethernet enjoy wide currency in the marketplace is indisputable. But when one attempts to determine the dimensions of the deployed base of Ethernet in the public carrier space, one is forced to conclude that the ascendancy of Ethernet lies somewhere in the midterm even by the most optimistic estimates. Besides, I question the feasibility of pure Ethernet over fiber.