@the last AC
The PS3 will only remain among the cheapest Blu-ray players while Sony continue to subsidise all those billions in development costs with software sales. As you yourself suggested, Sony can't sell it at a loss for long.
But it's plainly obvious that the PS3 is not what you'd design as the most efficient method of playing Blu-ray films. As the format matures, system-on-chip designs will start to undercut that dramatically - a PS2 is over 4 times what you can pick up a standalone DVD player for. Samsung, Panasonic and indeed Sony themselves have players that can be had for less already. That they're last year's spec isn't going to be an issue now the Blu-ray consortium finally have a standard they're hapy with.