Don't blame congress, we should blame ourselves if we continue to vote for elected officials who support luddite environmentalist public policies.
I did not realize that automakers were thinking about phasing out diesels. In fact it has seemed the opposite to me at least in terms of light trucks. Diesel engines are finding there way into more and more Dodge, Ford and some GMC/Chevy trucks. The 5.9L Dodge/Cummins 24valve turbodiesel and the Ford/International 7.3L "Powerstroke" are quite popular for their incredible torque, durability and relative fuel efficiency especially with gas prices so high. I also read recently that Ford was going to put a diesel into some of its large SUV's. Hopefully the environmentalists will not prevail since even in "Green Party" Germany diesels are popular.