actually, sony is in trouble. They lost out big time in the portable music market by pushing the MD and missing out on the MP3 wave. This let smaller companies like Samsung, iRiver and Creative Labs really take a bite into that market. In America, the ipod rules all.
They never pushed into the top three with their cell phones and had to join up with Ericsson and even still, motorola and samsung have really established a stronghold when it comes to high end, feature rich phones.
Televisions, sony has also taken a beating... Samsung has been running up and down beating them with in the LCD/plasma market and whole DLP thing really has made a big dent.
In short, smaller companies like samsung and LG have really taken a big bite out of Sony's market and Samsun is expected to surpass Sony in terms of worldwide brand name recognition.
Is sony done for? Not hardly, they are a well diversified company and their recent movies have done well... but definitely their core electronics market has been shrinking and they are vulnerable.