As I've been saying for a couple of days now, the memos are forgeries. CBS News is trying hard to recover from this, but they're going to take a big hit over this. Their recovery will be down the road.
Burkett is completely destroyed as a source. He's evidently refusing to tell CBS where he got the documents. Okay, then. He's got to expect that people will assume they came from his own hand then. It's a reasonable assumption.
This will overwhelm the whole AWOL story for a while, but real questions are still being raised by many different media outlets, questions that have never relied on these memos. The truth will out, as CBS has learned the hard way.