If we rush the field it will probably give us less respect nationally. Let's say we don't rush the field. The media will be all, "Oh, these fans must of expected their team to win, they really are the real deal." Now, lets say we do rush the field. The media will be all, "Oh, these fans must think their team is not worthy of being in the top 10. Lets not give them hype for the National Championship when they go undefeated."
This may totally be wrong, but if we are ranked higher, I just don't see the point in rushing the field.