I wholeheartedly agree. Stronghold Pazaak or Sabacc games with friends would be a load of fun. Even to look at as a decoration. In Knights of the Old Republic 2, they had "Republic Senate Rules" for Pazaak, maybe you could play that way, or gamble credits with your friends? I think there's a lot of potential to do it right. Other Sabacc games online aren't trustworthy, IF they even work, wanting you to install their third party software on top of probably not even having the technical copyright permissions to host the game. Simply search "Sabacc game" and you'll find dozens of sites co-opting the name.
Adding the card game would add lots of side content with a huge potential for customization. Custom designed card decks for Pazaak, character titles, stronghold decorations and more. Imagine the fun character titles they could do with this. "The Idiot," "Idiot's Array," "Pure Sabacc," "Pure Pazaak," "Corellian Spike," "The Evil One," "Bomb Out," "The Star." Knights of the Old Republic 2 had a character on Nar Shadda called "The Champ." I see a potential for a fun side quest or Night Life Event quest. Even a character title.
Now that I think of it, another mini-game they could add is their own chess-style game, Dejarik. They'd have more liberty with the rules in this one as Sabacc and Pazaak's rules are intricately designed and known.