That's an interesting Article.
From my own experience; Since I know we'll be flying to WDW from Saturday to Saturday during April School Vacation week, I've booked airfare the day the fare becomes available. If the fares and flight times were way out of line that day, they always got worse, so we plan to get behind the wheel and drive. We usually save at least a thousand dollars by driving to WDW. We've driven to WDW twice it's not that big a deal, but I'd still rather fly. The 6 times I've booked our airfare it's gone up to ridiculous amounts after we booked. So in May I'll be looking to book our Aprill 2012 airfare to WDW.
Good Luck All,
Joe