Can a PS2 handle all the games that are / can be developed on a Wii?

[HappySqurriel]

Games that ran at 30fps on the PS2 ran at 60fps on the Gamecube with improved textures and effects, games that ran at 30fps on the Gamecube run at 60fps on the Wii with improved textures and effects ...

This means that you can port a PS2 game to the Wii, or do cross platform development, but you can not port a Wii game to the PS2 without a noticeable downgrade ...