I actually did talk to Marc. He mentioned he was sick, so he couldn't make it. He asked what I thought and I honestly said it was a really off year and the X Games really killed it. He took that criticism with stride.
That's the excuse that he used when I was at AX last year. It's also not the first time that he used that excuse. (I could also see that some of the staffers had a great look of skepticism if he was really sick.)
He was also healthy enough to show up at a Anime Conji meeting prior, and after AX.