I think there are several Wii Titles which will see a return to higher sales over the holiday season (Mario Galaxy, Super Smash Bros., Mario Kart and Wii Fit) in part because a lot of people who buy a system will buy (at least) one of these games; if the Wii does sell 10+ Million units from now until the end of the year, it won't take an amazing attach rate to sell millions of copies of these games over the same time period.
Another thing is there are certain multiplatform games that may sell many more units on the Wii than the other systems (Lego Batman, Starwars: The Force Unleashed, and Guitar Hero World Tour), many third party games with a track record of selling over a million on the Wii (MySims Kingdom, Cooking Mama: World Kitchen, Rayman Raving Rabbids: TV Party), several third party titles that could see break out success (De Blob, Samba De Amigo, Starwars The Clone Wars), and Nintendo still has Animal Crossing and Wii Music which both have the potential to be very big sellers over the holiday season.
