As I've posted before, I can't see prices coming down at all for another 6 months or so, when 3BPC and 4BPC MLC NAND starts to arrive, and can't see SSD's coming back down to their summer '09 prices for a year.
Big concern for me at the moment is that at the moment process advancements are no good for SSD's, shrinks and increasing the Bits Per Cell (BPC) of MLC NAND both hurt the lifespan of drives - to the extent that they will be wearing out in a few hundred erase cycles - fine for mp3 players, smartphones, usb keys etc, but unacceptable for SSD's - so theres not going to be a predictable price drop in SSD's when NAND with better memory density arrives, any drop will be indirect and due to reduced demand for SSD quality NAND - Flash manufacturers will definitely be reducing supply of it though so they can divert production resources into smartphone quality NAND.
I expect we'll see SLC drives becoming dominant again when we shrink to the 20nm range, which will give us better performance and lifespans than we currently have, but prices will stay over £1/gb with SSD's firmly in the enthusiast pigeon hole for another couple of years.