Was graphics power part of the reason the PS3/X360 took most top 3rd party games from the Wii?

[Scoobes]

Well, it's part of the reason. Developers could easily (relatively speaking) port from PC to 360 to PS3, whilst they had to make significant cutbacks to port to Wii. A little bit of extra power and programmable shaders on the Wii GPU would probably have gone a long way to satisfying third-party devs.