It is certain that Sega of Japan plans to discontinue production of GD-ROM media in February, 2007. This media is used almost exclusively by the Sega Dreamcast home console, and the NAOMI arcade system. By stopping production, future official games (licensed by Sega) on the Dreamcast or NAOMI will not be possible.
I still love my Dreamcast to this day. It’s never been unhooked from the TV! The fact that games are -still- being developed for it goes to show how many fans still exist. When it comes to that console, it was all about the gameplay, not the graphics. If you are a DC fan, you can head here and download/print an image to sign and send to Sega. This may or may not thwart their decision but it’s worth a try.