It's a chicken and egg situation...
Selling PS3's isn't good for its own sake, it's good because it provides an avenue via which they might purchase PS3 software and services (in the near future I'm sure). Now, havign software 'hooks' to spur the initial purchase in the first place is of course a great thing, but it's always too chancy to rely on external leverage. It absolutely *was* the key enabler of Playstation and Playstation 2 - but strange market dynamics conspired tomake it of mutual benefit to both Sony and developers. Over the past five years Sony has been expanding their internal software efforts in leaps and bounds, and personally I think their best shot at it all comes in the form of creating a Halo-esque hit to set them apart. I don't think it's Killzone, and it may not come at all, but whatever the short term pain of it... I do think it's better in the longrun to invest in yourself and your exported system tools than to invest in the efforts of others.
Agreed, I just think they are extremely late in this regard. With better tools they would not have lost the "lead platform sku" they had lats gen and seemed to have early this gen. This should have been priority number 1 and continuously refined while they secured the exclusives.
Idealy they would have also let themselves a back door for a BRless ps3 but they cornered themselves in their current high price which only adds to their current problems with key exclusives being lost.
We'll see how it turnes out.
IMO:
route 1: ps3 is relegated to a close 3rd place WW and is accepted at Sony HQ for this gen with the hopes of regaining their position with an early ps4 launch.
route 2: Playstation brand is sold based on continued losses and pressure from stockholders