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The reason it won't be brought into the U.S. is
the Obama administration's decision to allow the states to individually regulate tail pipe emissions and carbon emissions.
Every major car manufacturer which did not already have a diesel on the market dropped development when this change was announced. The 49 states plus California rule was troublesome enough, but the many state rules that will come simply is not economically viable for the auto makers.
That leaves VW & MB as the major manufacturers selling diesel autos. (Please don't count the diesel trucks in this category. Although they are useful, they are also already on the market.)
The differences between the prior U.S. rules and those of the E.U. are not as great as many imagine. The initial delay in clean diesel adoption in the U.S. was because of the unavailability of ultra low sulphur diesel fuel in the U.S. It was further delayed after some natural disasters impacted refining capacity.
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