With Nissan killing off the Pathfinder (in he proverbial sense) it makes the Xterra is the only hard-working SUV in their line-up. In the class of full-framed SUV's, there's not much either. You've got what, the JK Unlimited, the 4Runner The FJ Cruiser and the Xterra if you need an SUV that does more than move people and groceries, but you don't need a pickup truck. The benefit of the Xterra is that its shared with the Frontier, and on the Titan shared platform, so it helps R&D and manufacturing costs. I don't see the X being killed unless they kill off the Frontier as well. And if it's true, if the Jeep is going IFS to save on fuel, it really makes the X more competitive against it. The X did get diesel, so Nissan has experience with it. Diesels are getting popular here, look a Mazda and GM bringing it here this year. You never now also if Dodge makes the diesel more popular in their lineup (as the Liberty had), it maybe needed to stay competitive in the market.
Don't count the X out just yet.