Perhaps that can change in the near future if theymos or Cyrus approve cryptofrka's merit source application that specifically targets the gambling board as a destination to distribute merits.
I do believe that his merit appliucation will be eventually approved but I don't think that it will happen anytime soon. From what I noticed, theymos usually introduce new merit sources/removes inactive ones and generlaly readjust merit source allocation only when there's a big drop in the amount of merit shared and if you check the merit stats you will notice that those number still look pretty good compared to 2 years ago when theymos did the last readjustment. Add on that the fact that activity has been constantly decreasing (not in gambling board though) which is another factor that might affect his decision
Some time ago, a user applied to become an altcoin-board merit source, but I can't remember how that story ended.
Probably not good given their measly merit/post ratio (for example, Altcoin Discussion board had only 0.05 merits/post last month).