Don't make too much of it - a year or two before that there were huge queues at E3 for the id booth, where Doom 3 was demonstrated behind closed doors.
I dunno. In the case of the Wii, the buzz was immediate and it came from traditional gamers and traditional gaming media. The people who were lined up for hours to get them at launch are not what I'd call casual gamers. The Wii has had success with gamers. As word of mouth spread, I'm sure casual interest grew. But all this talk that gamers don't buy the Wii or play the way is stupid. I'm sure there are more parents and casual gamers buying it for their kids, which is probably where the big difference in sales comes from. If I had a young kid, I wouldn't be buying her an expensive HD console.