When will see a Wii, PS3 and XBox360 slim models appear on the market?

[MattAAron]

Is slim that big of a deal? If I recall correctly, a majority of consoles never got slimmer... No Nintendo console has ever got slimmer, no Xbox console, No Atari/SEGA, the only one I can think of is the PS2. (Did the PS1?)

I can't see why Sony/MS/Nintendo would even care about a slim model line...not until the generation is nearly over with atleast...