By May (or April if you consider its earlier launch) of this year is when the PS2 got its third price cut of $30, bringing it down to $150. The Wii coming down further in price is possible, though Nintendo will only do so if it really underperforms during the year. It's highly unlikely, I'd say. The Wii would end up costing less than the DSi XL!
The PS3 does not need a cut, and will not get one. It's selling fine as it is. Any more seems pushing it, especially when you consider how long the X360 held onto its $300 price.
The X360 will get its cut, definitely. It has been a long time since. Keep in mind that the X360 core model launched at $300. It has retained its original price better than the PS2, which also debuted at $300, yet fell to $150 by May of its 4th year, and $130 by April in its 6th. This is the X360's 5th year on the market.
