Today, that is the case.
But given that those keys allow absolute access to the hardware, you figure it's only a matter of time before we have all sorts of ways to run whatever on the PS3.
We have all hardware documentation, all software documentation, all access to the hardware, all access to system/OS keys...At this point, what we can and can't do on the PS3 is limited only by imagination, skill and time.
Honestly, the potential of that is fucking mouthwatering. The locked-down PS3 was parallel computing, folding, (originally) running Linux and playing back a lot of media out of the box. A totally unleashed PS3 could conceivably - when all is said and done - emulate or play natively every game ever released anywhere (outside of PC, Gamecube, Wii and Xbox games), play back every kind and every codec of media that exists, play back every kind of video and audio disc (short of Laser Discs and HDDVDs), run all manner of homebrew application...
...fuck, my dick is hard