Exactly right. Very little is at risk from rising sea level at high tide. Places like this are at some risk during smaller storms, because they're so close to

Exactly right. Very little is at risk from rising sea level at high tide. Places like this are at some risk during smaller storms, because they're so close to the new mean. However, a whole lot is at risk from hurricane storm surges. The change in mean high tide is not the important part of the story, it's the change in extreme events. The atmosphere is like any other system of waves -- increase the energy in the system, and you increase the amplitude (the frequency being largely limited by the shape/harmonics of the Earth). So, big surprise that we'll expect more extreme events with climate change. Warm ocean water is the fuel for tropical cyclones, so risk in these low-lying areas can only get worse.