Recessions bring about these kind of things. The bigger, healthier storage companies end up gobbling up the smaller ones. Such is the case with Western Digital buying Hitachi, and this will continue. As the industry moves to SSD, some of the older platter-based foundries essentially become obsolete, leaving a lot of cap-ex on the balance sheets for these manufacturers. 
Not a surprise to see this happen, as Hitachi is a huge company, and their storage unit merely a small piece of the pie. Western Digital has gotten better at what they do as well, as we see a lot less of them coming through for hard drive recovery than we had just a couple of years ago.
Not a lot of players left in the industry, but that, too, could change. SSD has leveled the playing field once again.