Sony announced that they will be discontinuing the MiniDisc, with sales of equipment, devices and discs terminating in March 2013. The main reason is low sales naturally. It will be sad to see the MiniDisc go, especially since it has such a special place in my heart. My first player/recorder was the MZ-R900 and finally settling on the MZ-N10, which I still own along with a plethora of discs. Depending on the source, 22-27 million units were sold since its introduction back in 1992. As long as Sony doesn't kill off the MP3 Walkman, the brand will live on, for now.
Source 1, Source 2