There are 73 million sellers on the Wii. Disney Sing It and Punch-Out!! will probably reach 1 million sales this week.
Games that probably are million sellers but are missing data:
Rock Band 2
Dance Dance Revolution: Hottest Party 2
Also there is one more million seller Summer Sports: Paradise Island, it has it's sales divide in two entries, but together it goes over a million.
Games that I think will crawl to 1 million by the end of the year:
Endless Ocean
High School Musical 3: Senior Year DANCE!
Monster 4x4: World Circuit
Sega Superstars Tennis
Guitar Hero 5
Just Dance
Call of Duty: Modern Warfare: Reflex Edition
Unreleased games that will cross a million:
Zelda Wii
Metroid: Other M
Super Mario Galaxy 2
PokéPark Wii
Whatever software will be bundled with the Vitality Sensor
In total that would 90 million selling games. The problem is I can't think of anything else that could sell over a million, sure there may be surprise releases or games that will crawl to a million out of nowhere. However 10 games isn't that much and I think the goal is achievable.