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Hi,
If the wheel covers only had to move for turns above say 25% of the steering lock, then for normal driving the cover would not need to move from flush. It would move for tighter turns, which usually happen at lower speeds anyway. Also, since it is fixed only to the steering motion (and not the suspension) this would keep it from adding to the unsprung weight.
There is an aerodynamic advantage to having as little air space as possible around the tires -- but having that sort of a snug-fitting fender is a slightly different issue from this kind of pivoting cover. Because unless if you limited the vertical travel of the tire, then a snug-fitting "inner fender" would have to move with the suspension and with the steering, and this would add to the unsprung weight and to the complexity of the design.
So, it depends on how many aspects of the aerodynamics you want/need to address.
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