Plans scratched for new ROK capital

From BBC - "South Korea's constitutional court has blocked a government plan to move the capital from Seoul to a new site."

There goes the speculation on that subject, which apparently was a huge part of Roh Moo-hyun's presidential campaign. The article cites poor planning and high cost as reasons for blocking the plan, as well as the need for a consitutional amendment or national referendum. Beyond that, I also think that if the issue of concern is Seoul's proximity to the DMZ, then moving the capital south might protect the structure of government in case of attack, but it would do nothing for the twenty million people living in or around the current capital. Any thoughts?