I felt that the risk of the summit was slightly greater than any potential benefit. The fact of the summit was likely enough for the House of Kim to get the sanctions he really cared about...at least modified, if not lifted. He only really cared about what China was willing to do, as trade with China is all that really matters. China needed cover, the summit provided cover.

On the other hand, nothing has moved in decades, so the summit was at least a new approach. While I felt it was unlikely to work, it WAS something different, and was unlikely to do enough harm to really matter. The reason I thought the harm was unlikely to be very great was because I felt that China was looking for some way to ease sanctions to begin with, so the harm done would likely happen with or without the summit.