For such a process shrink, there is very little saving being passed onto the consumer. On top of that, the reduced endurance will simply be horrible. As seen with TLC, you basically had people who were willing to give up 70% of the endurance, just to save around 15% of the cost of an SSD. With these 15nm parts, the are significantly smaller and cheaper to make, but there is literally no cost saving. compared to 19nm, and 40nm TLC designs. They are pretty much reducing the process size in order to increase profit margins.