I believe people will start going with less is more. At 4 3/4" this blade is prefect for most anything I will ever need a knife for. Game processing, shelter building, fire and any other simple camp chores. Or the 3 1/2" Reverse Tanto below, I am fully comfortable with. I don't own a knife with a blade longer than 5". I have used either one of these knives for multiple night stays in very cold temps and was fully able to get by with out the use of a larger blade. I know a lot of guys on here are not fond of the hollow grind, but all of my "survival knives" are hollow grind and they suit me just fine and are tough as nails.
Look at les Stroud, he typically only carries one multi tool as his only cutting implement and gets by perfectly well without an 8" blade. Even if you were not prepared and found yourself in a survival situation with only a 2" picket knife, it still comes down to knowing how to use the knife and knowing what it's limitations are.