Yeah, that's how it always works. You need to keep playing to win more BFG tokens so your dividend stays the same or increases. Luckily the number of BFG tokens that can be mined is capped, but for the moment only 50% of the tokens is already mined.
52% has been mined to be precise, and if i may add, 51% of those total mined tokens have been burned also. Burning rate seems to be rather effective imho. Funny enough, most of the BFG burnings happen when people gamble with it. Greed seems to be a good for burning and i can't see it ending even if BFG pays more, because it's just that greed what makes people want it more so they are willing to gamble with it.