You know, just to add to the argument, I think the ratings are proper for the EcoDiesel and Rob is on the money. Basically, it's the "Do we really need 400HP?" argument when it comes to towing. The Ecodiesel will get the job done, albeit at a slower pace. But then the Ecodiesel already has a little more horsepower than a Cummins equipped HD Ram from as recent as 2003 (the regular output Cummins). I'm pretty sure these EcoDiesels will have an aftermarket ready for them since these are already out in Europe.
Hell, thinking back, were we even given enough with the regular Cummins back in 2003 with their higher tow ratings in the HD trucks? So I think it really is down to the argument of "Do we really need 400HP?". Hopefully the consumer market will appreciate the superior fuel economy and understand that this is enough power, that it will finish the race, it just won't be in 1st place.