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The idea behind reducing aerodynamic drag is to disturb the air as little as possible as you drive through it, the more you disturb it, the more it swirls around after you pass, the more energy it takes to keep moving. The longer sloping tail helps the air to gradually get back into the place it was before you drove through it, thus making it swirl about less, and this is what reduces drag.
A pointy nose may help a bit, but the air is going to move up, and sideways to go around your vehicle regardless of the shape in the front, it will in fact form a fairly good shape itself because the air knows you're coming several feet before you reach it.
From what I've learned here, 25-30% of aero gains can be had in the front, another 70-75% is shaping it right in the back.
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