...and another thing...what will really HELP is the LIMITED amount of DRIVERS required for PS3. Porting to x86 would be a COLOSSAL waste of effort cos then you'll get disgruntled new users going bananas cos device xyz is not supported.
Look at Linux, I've been a stern advocate of this OS for MANY years (before all the nice graphical install routines) but it STILL bugs me (have to muck around with kernel modules and having to rely on Joe Bloggski from Poland to get his finger out for some software incompatibility issue between different releases and "distributions". What a pain in the ar*e! - no offence to anybody in Poland, it's just a fictional example...)
This is NOT what an average user WANTS. It's not what I want at all. We just want things to WORK....and THAT is where the beauty of the PS3 comes in: RESTRICTED amount of hardware to support out of the box. It'll just work and then we can all be PRODUCTIVE doing whatever we want. And THEN, if anybody wants to produce a driver for device xyz then well done you! The important thing is that the BASE system should JUST WORK and we won't get that with an x86 port (sorry guv, don't recognize your NIC, you're screwed mate).
The biggest PLUS though is that a PS3 port (of OS4) would just be plain SEXY, and you can't say that about some bland, anonymous tower system. It'll get HEADLINES.
It has GOT to be the way forward.
Also, remember this: It is EASY to think of many reasons NOT to do something but if we all thought like that we'd never have faked the moon landings ...
;-)