This finding, drawn in large measure from Yohe et al. (2006), refers to aggregate measures of vulnerability projected over a one-century time scale; it cannot be interpreted as meaning that every sector and every person would be incapable of adapting to preserve their standards of living. It does, however, suggest that responding to climate change and associated climate variability over the very long term could become increasingly more difficult and expensive across developed and developing countries, alike.
To summarize, more nuanced analyses of some sources of vulnerability to climate change that would persist and, indeed, continue to grow over the coming millenia are required to provide useful insight into the consequences of stabilization over the very long term. Since rising seas are the source of one such persistent and growing threat across the world, though, it is entirely plausible that displaced people may be forced to migrate even if temperature increases are capped. They may move within a country or region (like, as reported in Kates et al. , the tens of thousands of people who moved to communities across the United States after Hurricane Katrina and have decided not to return), but they may not.