LOL go and type in Sram and mosys 1t-sram tell me the bandwidth of it then tell me what the bandwidth of the HD systems are. Then go and look up how much the GC can compress a texture. Look this stuff up before we start talking. Those 88 megs are not your normal ram. The GPU of the Wii is not set up like the other GPUs. Lots more stuff is hard coded which is bad if you only know one way of setting up a shader of mapping textures to GPU memory. More hardcore gamers should educate them selves on these mysterys or forever believe the hype found in PR press kits.
It's a good debate yet you may learn more about graphic which is a good thing. Do some research and tell me what you find ok? Then we can get started. You'll always find better data in the unbias forums of a tech forum or developer docs or papers.
Or you can just wait to see what factor 5 pulls out of their ass?