Sega Model 3 & The Dreamcast - WTF Went Wrong?!?

From what I can tell, Blue Shift was clearly intended as the major new feature of Half-Life on Dreamcast, but can you imagine if we'd then been treated to a standalone disc containing the multiplayer elements, plus something like Counter-Strike or even Team Fortress Classic? Sales of the core game itself would surely have suffered massively as a result of such an expansion, especially if it also allowed for full online and the more typically expected offline split-screen support as well...