The reason for cutting production of these vehicles like the Nissan Armada and the Infiniti QX56 is that they have all performed poorly in terms of sales this year, making it more and more likely that they will be dropped soon. Plus the fact that strict CAFE regulations is making it harder to see big SUVs on the road. Currently, the Nissan Armada is selling around half the units it did compared to last year, while the Infiniti QX56's sales are down by over a third for the year to date, that what reports MotorTrend.
However, this report doesn't mean that the Armada nor the QX56 are dead yet. The news could just mean that Nissan will be shifting production of these models to other plants, and next generation will probably be based on smaller wheel bases, to move them in the crossover class. We'll just have to wait and see what happens.
Source : [Nissan, MotorTrend]