When I was taking my ram specialist certification when the 1st generation of eco diesel was coming out (Grand Cherokee), the training team spent a lot of time trying to convince us that the R.O.I for an eco diesel would be easily realized. What I have seen in the marketplace is that once that engine has about 160,000kms on it, the truck value plummets like a sinking rock. Because of the massive cost of maintaining the vehicle. And lets face it, this aint no Cummins motor.
The problem is that the EcoDiesel is absolutely plagued with issues due to the emissions system and the complicated engineering. When one component fails it may only be a few bucks to buy the new component, however the man hours needed to do a tear down to get to the problem for the fix is the serious issue. EcoDiesels are a great idea, however the realworld application that we are seeing here in canada is not worth the extra. $250 oil changes, DEF fluid, more expensive fuel and the added maintenance to a diesel.
Also this is the most common setup that arrives at the dealership "on the hook" or being towed in on a tow truck. They tend to die and strand people. If you drive a serious amount of highway driving and put on 100-200kms/day this is the truck for you. City driving will destroy this engine. Ive seen 5 years of history of that problem when the Grand Cherokee brought this engine to the north american market.
With what I know, what ive seen for real world problems, if I have a client coming in asking for an eco diesel, I will actually do everything I can to try to talk them into a gas engine. Ultimately its their choice but I dont want the phone call after the ecodiesel causes them grief.