Doesn't make sense
There's no way Sony could make serious inroads into the price of the PS3 without compromising the compatibility of the machines.
It can't reduce the number of Cell processors without interfering with the development of games - the dev kits are already out there with seven processors. And the last thing the machine needs is any interruption to the trickle of games arriving to market.
It can't scrap the Blu-ray drive. Not only is BD Sony's trojan horse into everyone's living room, its the money spinner they need for the next decade - owning the patents, codec, pressing plants and distribution system for media is how Sony intend to remain rich into the future. But also, PS3 games are being shipped on BD - there's no way companies would switch back to DVD, they'd abandon PS3 first.
Strip out components? Which ones cost enough to make a real difference? A 20Gb drive isn't much cheaper than an 80Gb model, WiFi is a couple of pounds, USB must be a pittance by now. I strongly suspect there is no fat to be cut on the PS3. Thye have to wait for volume and Moore's Law to push down the price of the high value components.
And it can't afford to subsidise the console further, the PS division is barely breaking even at the moment, the rest of Sony isn't nearly as healthy as it once was. The shareholders aren't ready to take a loss.
Sony has to wait it out and hope the differences between PS3 and 360 start to become apparent in the market. The next year or so the differences won't be huge, greater power in PS3 will be matched by (programming expertise with the 360 (which is producing some stunning games right now) but I'd expect that increased familiarity with the PS3 development environment will show up by the time E3 comes along next summer. Then the PS3 might become the console to own for the next gen (next next gen?) experience.
Their biggest problem is that Sony seems to have inherited Microsoft's old marketing team. Just as Microsoft unveil some seriously cool marketing around the 360, Sony deliver - well, the PS3 adverts. Dreadful, horrible, nasty, unintelligible - doesn't even begin to cover their marketing. Where are the TV ads for the games? Where are the playable demos? Where are the posters?
What must worry Sony is the possibility that Microsoft will to gain a jump start on the market by announcing a 360 successor ahead of the usual product cycle. It worked for 360 and gave the console 18 months in the market without a serious rival. Do it now and people might hold off PS3 entirely waiting for the next console. It must be tempting to try and push on with another XBox, but the strategy has been horrifyingly expensive - even for Microsoft. The XBox division is still not profitable and they've just taken a massive hit over shoddy, rushed to market hardware*. What would a reliable XBox 720 cost to develop and market? No idea, but the price will be well in excess of 'ouch!'
* That's one thing Sony have got right - the PS3 has the quality you expect from Sony. It's beautifully finished, quiet, cool, compact and comes sans huge power brick. And there doesn't seem to an equivalent of the red ring of death. They should be proud of the engineering in the machine.