The momentum is carrying over to next year, after Jensen Button claimed win number 6, Ross Brawn decided to shift the focus to 2010 and halt developement on the BGP001, their car is pretty much designed and being wind-tunneled as we speak (obviously not now because its close to 4am lol).
Take this into account: recently Brawn admitted that the Mercedes engine was never fitted properly into the car as it was designed for the Honda engine, as a result the engine was a few inches higher than it should have been, wrecking the centre of gravity.
They only did what was need to do to win the title, not win by overkill. People are underestimating how clever Ross Brawn is, he's not a complete dumbass like Peter Windsor.