Dawkin's Response to Why He Refuses to Debate Dr. William Lane Craig
You can tell from the tone of his voice, he's agitated. Being publicly exposed might easily explain it.
Perhaps he won't be as busy "after Christmas" and will accept the invitation next year. ;)
My prediction: Similar to a boxer who gains a little fame for a time but knows he can't stand up to real competition, Dawkins will find some stiffs or dead weight to debate and then claim he's fought the competition...
I hope the question continues to be put to him, often!