As a matter of fact this would make sense, since the guys working on the Dreamcast at the time went to Microsoft around the time the Dreamcast was failing and asked if they could make the original xbox backwards compatible with Dreamcast games. The only reason the idea got rejected by Microsoft was because Sega wanted the Dreamcast games to run on-line through Microsoft's Xbox Live service. Think this might just be Microsoft making good on a ten year old deal, and so are sticking old Dreamcast games on XBLA. Hell, Hydro Thunder is getting put up, what's to say the rest aren't going to.