I'm inclined to agree. I'm still unclear on just what "taking the lead" would entail here, but my impression is that it means talking first and loudest. That would be Dubya (by proxie, of course). Ain't nobody going to posture before he does.
A more productive question might be: who do you think isn't doing what they should? The obvious answer is China, of course, but that's a bit unreasonable, IMHO. They're probably scrambling to sort out just what their own interests are at this juncture. They were almost blindsided, I think.
Bear in mind that I'm . . . extremely critical of the PRC government in my personal life. So much so that I don't ordinarily discuss Chinese politics online.