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The technology for super-aerodynamic bodies has been around for many, many years. People have been building streamliners all along, for salt flats runs, and human and solar powered vehicles. I'm sure that at some point, someone involved with one of these streamliners thought about building a daily driven one. But why give up the practicality and presentability, when all you have to gain is fuel economy?
A boat-tail would have been nice to have during the 1970's oil crisis. However, with a national speed limit of 55mph, aeromods had less of an impact than they would today. Plus, there was a lack of good donor platforms. Tall, square roofs mean the tail must be extremely long, to the point of requiring a trailer, which is too cumbersome for a daily driver. Also, back then, the vehicle's wake was just one of many major aerodynamic defects. Cd=0.13 would have required major rework of almost the entire car.
How many daily-driven streamlined cars are there in the USA? One? If there were instead a few dozen, it would be more likely that someone would see one, and ask an automotive customizer to build one.
However, if you don't build it yourself, it won't pay for itself in fuel savings. Nor will it serve your eco-vanity, because people don't currently know what boat-tailed cars are and why they should want one.
At the current price of gas, major automakers would be stupid to touch them. Just look at the reception that the Honda Crosstour recieved, then multiply its overall length by 1.5 and imagine what people would have said. Except perhaps for a few X-Prize contenders, streamlined cars will remain DIY endeavours.
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