A $100 price cut in 2008 would seriously harm any chance of the console ever turning a profit.
I think this sentence is a pretty strong and unsubstantiated statement. 100$ may seem like a lot of money but every additional console sold means more games, more accessories etc. sold. Most people buy at least a second controller, a couple of games ( 9 for the PS2 I think), perhaps a Playstation Eye, some online games, a few BluRay discs etc. pp.
So the question is: Whats bigger: The number of PS3s they sell times 100$ or the longterm profit of the additionally sold PS3s.
In the end it doesn't matter when the 360 drops the price they have to follow. At the moment they sell quite healthily but they cannot afford to fall back.
I still remember a similar discussion I had with someone 2007. He said Sony would never drop the price before christmas but would wait till April 2008. They couldn't afford it, nobody would drop a price for christmas etc. pp. Two months later the 40Gb was shown for 400$. Besides producing computers gets LOTs cheaper in two years.