Dice games are always good and will attract people to play them. especially if they are already invested in the casino and have funds there. so i guess adding dice is a good option.
but also as others have suggested i like Slots also, but it has to be a good design and easy to open on all devices.
Yes there are a lot of people that likes to play dice indeed and if there will be more games than we make it also more acceptable and that is perfect for Bitcoin.
But people are also now realizing that gambling is quite bad but they are still playing so that is good.