Where did he get that 323 number? I count 279 *including* print variations.
Anyway, the Dreamcast is by far my favorite system. Say what you might about the lacking library, but there were a number of solid gems not available on any other console (domestically, anyway) Gundam Side Stories FTW.
That being said, Sega is done. If they were to release new hardware, it would be as niche, and probably more so, as the Neo-Geo. Failure would quickly follow.