Almost as if Merc struggled to get it to work so they want to get it banned in case a rival team succeeded.
The FIA simply need to require the front wings to be closed sections just like the rear wings. It woudl be a mere closing of a loophole, it makes sense to require all wings to be closed sections, doesn't it?
Although Brawn has history on this with the DDD when he was part of the overtaking working group that developed the rules intended to limit diffusers.