I think there should be a free new channel which is a bit like MSN Zone where you can play card games etc with people whom you share friend codes.
e.g. Invite a couple of people you have to code of for a game of Texas hold 'em.
I think it would be good if it had other similar games - sort of like the DS game 42 classics but as an online/single player channel on the Wii. I think that this could boost wii sales by quite a bit if implemented and advertised correctly.
Something like the Parlour Channel or the Lobby channel (for lack of better names coming to mind )
I wouldn't mind paying a small amount for it though.