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Re rotors, on most cars I've seen the rotor's "intake" is on the far side of the wheel, so if you block off air from flowing out through the face, you're going to have hot air recirculating in the wheel well. The way I drive and most people around here drive, probably not an issue of course. But if you need the brakes I would guess that the cooling capacity is going to drop by a lot.
I've been looking at CFD pictures and I suspect that generally the spokes pushing air outward creates flow separation and thus reduced pressure recovery at the back of the car. Perhaps the Honda Insight/supercar rounded cutaway area behind the front wheels helps extract air from the far side of the wheel instead, and simultaneously helps air reattach along the side of the car. In high performance cars with brake ducts, the ducts go straight to the center of the rotor so it would be fine to have that air exhausting through the wheel well.
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