Nah. It can be argued that the PS3 helped force the more expensive hd format Blu-Ray on consumers, because it was like Sony said, 5 million idiots would have, and did, bought their console whether it had good games and a fair price or not.
But the second iteration of the Xbox never had that brand loyalty, and couldn't have sold that many consoles if it had been $200 more due to HD DVD. Instead, it sold on the power of quality games.
starcraft - Playing Games = FUN, Talking about Games = SERIOUS