I'm not sure why you guys are surprised by this pricing. 3/4 tonne diesels are even more money, though probably in the same ballpark with incentives. The Ram EcoDiesel might be a little cheaper after incentives - but probably not significantly cheaper for a crew cab 4x4 version. Plus who knows if Nissan will incentivize the truck like the others do...
That being said, I'm still not seeing the target market for this truck. In the half-tonne vs HD truck Venn diagram, how big is the overlap of consumers who want marginally more towing and payload capacity than a half-tonne (but way less than a 3/4 tonne), but with better ride quality than a 3/4 tonne? Unless the mileage is really that awesome with the Cummins (and since the damn thing weighs well over 7000 lbs, I kind of doubt it), I can't see this being a big seller.
I'm more optimistic about the regular Titan though (and the non-diesel XD). With a revised 5.6L (finally - after only 12 years!) and hopefully much slimmer weight (and price), maybe it can carve a niche in the half-tonne market. Let's hope Nissan fixed the reliability issues that plagued the old Titan though!