Interesting article went up on Gamesradar a couple days ago: Could motion control cause a game market "crash"? | GamesRadar
Basically his argument is that the nature of trying to appeal to casuals encourages shovelware (because, as non-serious gamers, they won't go out looking for information, they will just see something appealing and buy it) and that we could become so inundated with shovelware once Natal and Move show up that we experience a fairly serious reduction in the market. Not as severe as '83, but big enough to force businesses to rethink what they're doing quite strongly.
Read the article and discuss! Inevitably rage against Wii/elitist self-procliamed "hardcore" gamers!