I can accept that for most areas, but some areas in New England for example, have become so pipeline constrained that Natural Gas prices are higher locally and no real fuel source for additional NatGas power to replace existing Nukes.
Also, in NE, the huge amount of hydro generation from Quebec makes up a huge share of their load. I don't know if Hydro Quebec is building any more dams, but I know that was one politician's answer to the closing of Vermont Yankee.