Flash memory has been increasing in popularity due to its shrinking size. There were papers presented at the recent ISSCC 2012 that discussed 128GB Flash NAND using 22-18 nm process technology while DRAM technology is at 4GB using 38 nm process technology (http://www.miracd.com/ISSCC2012/WebAP/PDF/AP_Full.pdf) .
This leads semiconductor companies to switch fabs from DRAM to flash. See "Hynix is switching production at a memory plant in China to churn out NAND flash instead of DRAM chips"
It will not be long before the size of the flash semiconductor chip market will be 2x the DRAM market size.