I was actually thinking about the rule change last night... I mean, if the aim was to prevent the tip of the nose going over the cockpit sides of another car, why couldn't they simple have mandated strong vertical front spoiler mountings UNDER the nose that would stop the impact?
You mean the ones that hold the front wing to the nose?
If you look at say Liuzzi's crash at Monza this past year...where he got into the grass and ran into Nico and Petrov while they were in the first chicane and their sides exposed to his front end...with a possible wreck like that, it wouldn't matter how strong those mounts are since the height of the nose was what the FIA was concerned about.
A strong mount isn't going to stop a car moving 200KPH+ in putting it's nose over something's that lower than it is. And if you made it from some super-strong material, then it would only rip the sidepod apart of the car it hits, not stop the car's nose from potentially spearing a driver.
The FIA had to mandate the nose heights in the interest in safety....the designers didn't have to make the cars ugly to comply with them, though.