I personally am hoping that along with Nintendo's on-line service some developers will announce plans to bring tried-and-true PC games to the Wii. I wouldn't mind some decent ports of Battlefield 2, Half-Life 2, Unreal Tournament, as well as some good RTS games like Command & Conquer, Medieval Total War 2, and Warcraft III.
But yeah, so far the Wii's largest issue is its complete utter lack of decent AAA games, something the PS3 offers in plenty. This is a concern to be sure of, let's hope the Wii can hang on to its popularity long enough to last into 2008.