I would have thought Sega will be making a lot more profit on Sonic & secret rings, Mario & Sonic Olympics than their high def games.
Now it's been shown that the Wii is hitting a more mature audience than the 360 and PS3, as it has a much higher average age and much higher percentage of women owners I'm really surprised that noone seems to be aiming towards this market. Making games that are challenging, interesting, but not filled with sweaty, muscley marines shooting aliens (despite this being described as mature in computer game circles it is not) or cartoon, sweet, childish design.
Zack and Wiki appears like it could have been like this if they'd have kept the levels the same, style the same, but just changed the characters to be a bit more universally appealing, ie the main character could have been a young adult, mid 20s with a less silly sidekick.
Wii sports does well at this because it isn't injected with testosterone to appeal to lads or childish, hence it appeals to everyone.