You think wrong.
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It is possible to disable DLC on the PS3.
In you XMB, go to the PSNetwork tab, Account Management, System Activation, PS3 System, Game, highlight disable then Click.
This disables DLC for all games though, not just Skyrim.
If you want to just do it for Skyrim, you need to go into Game Date Utility and delete the DLC. This can cause problems though with characters that have items from DLC, or have done DLC quests. Though not necessarily effects from DLC events (like vampires killing NPC's in cities...they'll still be dead though).
Now that is a horse of a different color since technically that content is not DLC, that is a physical copy. That might not be possible to do since it's all-in-one.