Media exposure is good, sure. But seeing an attractive women (Patrick and Vonn are two perfect examples) in a men's sport? That's network/advertising payday.
But there is a very big difference with Danica Patrick though: she drives a car, and the car can often make the difference between a win or big loss. It could be argued that skis are skis, with no advantage there, assuming they all meet FIS standards (she'd have to race on mens' legal skis), so the real difference is therefore physical and mental rather than mechanical. Does she have the mental ability? I have no doubt. Does she have the physical ability to match men? Well, that's the real question.
There was an interesting point made above though about weight and strength; all things being equal, if a man weighs more and has the strength to control that mass and inertia, that guy will have an interent ability in the downhill. It's simple physics. So there may be more to the equation that simply Vonn's ability; fighting biology and physics may prove impossible to overcome. That said, it would be a very interesting race, I have no doubt it would go mainstream and attract super exposure. That alone would be a "win".
I believe she is already on men's skis, although I don't know the racing analogy is that great. From a few interviews I've seen driving ability has as much or more to do with winning than the car's performance. A lot of the car's performance is dictated by the driver's understanding of the beast. Just like a ski racer can make slight tuning adjustments based off what they're feeling that could make up that slight difference.