i think the move is gonna do all right in the long run, it'll never be a blockbuster for them but it'll putter along enough for them not to just drop it cold (i do expect that $100 bundle to get a $20 price cut before next summer)
even if they were to only sell through the 4 million they shipped, that's a decent percentage alone to end up getting a few cool games out of it
best thing about it is that, aside from move-specific games, it's an entirely optional control method, so i'll mostly stick to buying games i was gonna buy anyway and consider any move support a neat little bonus
for the $50 i spent i'm enjoying it, it does what it was advertised to do