thats not true at all...
People bought it like fucking hotcakes...
the reason the Dreamcast went under was because of all the Piracy... Nobody was buying first/second party titles because it was so easy to just rip the disk and get the game for a mere rental fee. Third party sales also fell and caused Sega to lose a very large share of developers for the Dreamcast because they didn't want their hardearned work being played for free.
Piracy is what killed it, not lack of hardware sales.
Why do you think the Gamecube and Wii were and still are fairly hard to pirate (just because the games can finally be ripped doesn't mean they're very playable yet, and even then its on the PC in very poor quality) ... The appeal to piracy is to play them on the consoles... like the xbox, playstation or dreamcast... many good games can be had for a fraction of the price.