Well, is Bakura really in the dark world, or is that 4Kids again covering up death? :p
And yeah, Dark Bakura's too much of a tough guy to stay cooped up in the Millineum Puzzle for who knows how long. Wouldn't be surprised if he gets into a fight with Yami while in there XD....
It is not wise to meddle in the affairs of dragons, as you are crunchy and taste good with ketchup...