Regime change for North Korea

Christopher Hitchens on North Korea:

In North Korea, every person is property and is owned by a small and mad family with hereditary power. Every minute of every day, as far as regimentation can assure the fact, is spent in absolute subjection and serfdom. The private life has been entirely abolished. One tries to avoid cliché, and I did my best on a visit to this terrifying country in the year 2000, but George Orwell's 1984 was published at about the time that Kim Il Sung set up his system, and it really is as if he got hold of an early copy of the novel and used it as a blueprint. ("Hmmm … good book. Let's see if we can make it work.")

Hitchens says it's high time human rights groups got vocal about North Korea and organize an underground railway to get people out of North Korea.

Any Korean slave who can get out should be welcomed, fed, protected, and assisted to move to South Korea. Other countries, including our own, should announce that they will take specified numbers of refugees, in case the current steady trickle should suddenly become an inundation. The Chinese obviously cannot be expected to take millions of North Koreans all at once, which is why they engage in their otherwise criminal policy of propping up Kim Jong-il, but if international guarantees for runaway slaves could be established, this problem could be anticipated.

I'm all for it, but would South Korea or China cooperate?