Diesel Hybrids?

I am not sure if diesel Hybrids will become a reality soon. In the PNGV program, the Big Three resorted to Diesel Hybrids to meet the 80 miles per gallon target, but the cost was prohibitive. Diesels and Hybrids by themselves cost a few thousand dollars more than corresponding gasoline vehicles, so adding them together may not be easy. If, however, the fuel prices were to rise sharply, and the emissions are not a problem, more effort may go in to the Diesel-Hybrid combination.