First off the ps3 recieved a $100 price cut this year and only managed to pick up 1m units over sales last year. That is really bad news for sony as I don't know if another price cut is going to help them that much esp as bluray players become cheaper
Its not like sales cut have linear scaling. $100 price cut from 400 to 300 will do much more for sales than 500price cut to 400.