I've just come across a recent interview with Peter Moore where he discusses the death of the Dreamcast and the subsequent game ports to the Xbox.
The full article can be read here: http://www.glixel.com/interviews/peter- ... fc-w475540
In a nutshell, Moore claims the death of the Dreamcast wasn't his call - he was merely the bearer of bad news. He also explains the decision behind Shenmue II for the Xbox - it was a you scratch our back, we'll scratch yours deal. Microsoft 'came to the rescue' therefore they were rewarded with a number of SEGA exclusives in the US, including Shenmue II.