you actually think its going to stop after Mario Kart Wii?....lol. Seriously?
Games console dont just say "yeah heres all our good games, play them for the next 5 years, until we release our new console."
Games keep coming from First party as well as second and third.
Think: Star Fox Wii, Kid Icarus Wii, LoZ Wii, etc, etc.
and thats just first party. think about Sadness, Redsteel 2, Nibris' FPS, And all the rest i cant think of.
Still not enough? Well Wiiware launches in 2008. Not to mention the ever flowing river of VC games.
You wont run out of games to play man. trust me. weather you want first party or 17th party.