The map is incorrect for the Netherlands, because it simply looks at surface height. Large parts of the Netherlands are already below sea level and have been for hundreds of years.
Dutch water defense planning has already considered rising sea levels and increased the "Delta height" for dikes. They're made to resist 1 in 4000-10,000 year floods, depending on the value of the area they protect.
It's not a bad idea but the scale and defaults are not great. Even IPCC projections -- which Global Warming skeptics assert are pretty liberal in their rise estimations -- forecast less than a 1 meter rise by 2010. I think if it rose 7 meters, flooding would be the least of humanity's concerns.
Dutch water defense planning has already considered rising sea levels and increased the "Delta height" for dikes. They're made to resist 1 in 4000-10,000 year floods, depending on the value of the area they protect.