With all the process shrinks, and packing more bits per cell, NAND flash is getting to the point where its characteristics are closer to DRAM than traditional magnetic storage; like hard drives the data will stay there for a while when they're powered off, but like DRAM, it's not going to be there forever. However, unlike DRAM and more like hard drives, they wear out.

For enterprise cache-like applications this makes sense, but with DRAM prices not that far off (only a few times), I wonder if battery-backed DRAM might actually offer better value (and theoretically could be far higher performing) than having to replace worn-out SSDs periodically.