Last I heard....
Black Holes are not gates, as neatzo as that might seem from classical GR.
A black hole is a stellar corpse. Beyond the event horizon, the laws of physics are dominated by different phenomena. Matter probably exists in some "condensed" state, similar to the notion of the Bose-Einstein condensate. Just becaust the laws of physics are unknown beyond the observable horizon, it doesn't mean it's a magic gate to the world of our wildest dreams.
Jump into one, and you jump into one of our universe's trash compactors.
At least, that's last I heard...