In reality, the biggest problem with the Force is goal kicking and overall strategy. Foley is a great skills coach but never really set the strategy world on fire.
Biggest chance for the Force is to try and out perform the Brumbies forwards. If To'omua isn't getting good ball, the backline becomes useless in attack.
Biggest danger for the Force is that their backline doesn't fire. They've shown how powerful in defense and dangerous in attack they are, but also seen how they can fall off of the easiest of tackles and drop the best passes.
In reality, the Force know they have to win with a bonus point to not lose the Australian conference. They perform best when a team doesn't show respect or name their best team, but the Brumbies will be naming the best they can and haven't disrespected an opposition since the Kings. I expect a safe plan from the Brumbies which will, in the end, secure at least 3 tries and as many penalty goals. The Force could pull out 3 tries at most but without a solid goalkicker they just won't match the Brumbies.
So, revision to my earlier, super confident prediction: Brumbies 30, Force 10.