In a thread in the Marketplace I suggested a lounge board, maybe as a child board to Off-topic, as a good place for games and other things with little discussion value.
I enjoy playing a few games, but I think a gambling thread would be too encouraging and it would end up with too many games spread over too few players, so I think it would be best if it was mixed up with something else.
I think it will evolve, as it should. We are already seeing it go from people playing dice in the alley (the betting "trains" that we see now) to more sophisticated games, literally: Baccarat, Craps, "Darts", Hold 'Em and more. I think an actual gaming/gambling section is really needed. Also, if there is one, it's obviously a place that would tempt scammers to come in and make a quick Bit, and so there would have to be some sort of web of trust and moderation system in place. I think with this, we can avoid having a huge flood of dumb (in the sense that you just send a bet as fast as you can and hope you win) betting games with too few players.