He posted something about it. I think it was just getting too difficult to predict. There are too many factors like holidays in certain parts of the country, parties, free dining, weather, promotions etc. that make it hard to predict. Any little thing can cause an uptick in crowds. Also, everyone has a different perception of "crowded." One persons 7 is another persons 5.
I think it was also getting very popular. If everyone is following the same calendar, then it will have the opposite effect. A few years back, we kept running into one family on the bus to the park. We were following Easy WDW, and she had the exact same touring plan. After day 2 of being on the same park bus, she was like, "Let me guess, you are doing AK tomorrow?" She was right. We both just kind of laughed.