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Turbines do not like changing speeds. It generally takes quite a while (relatively speaking) for them to spool up or down to higher or lower power levels. They aren't a very good fit for an automotive application, generally.
The Mazda Wankel rotary gives some of the benefits of a turbine engine, and is more amenable to changing loads and speeds. But everyone thinks "Mazda" when they see a car with a rotary in it. Not such a good thing for Nissan.
I'd love to see one of the "halo cars" down near 2000 lbs in weight some time. I don't think it'll happen any time soon, though.
-soD
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