Its shouldn't take half a year on beths behalf.
Dude, it may not even be possible AT ALL.
The problem is that the PS3 shares its hardware resources. This means that it's rare to find even the simplest multiplatform game where compared next to an Xbox or PC the formats the framerate is lower.
They could give you Dawnguard and Dragonboarn, but because of the way the PS3 works it would continuously hang, or at best stutter unplayably in key sections of each DLC. It pretty bad in Dawnguard on Xbox, in places. The PS3 equivalent would be TERRIBLE.
This is all because Sony cut corners when building the hardware for their console. You really should be directing your anger towards them.