I think almost all casino will not support or accept altcoin to used in their site, they must prefer the primary coin (bitcoin) in every game in their site. Bitcoin cash is not the good coin for me it is one of shit coin in the market much better to used ethereum if some casino starts to accept altcoin in the future.
No mate now all casinos are updating sites and allowing players to use few altcoins like ETH, BCH, LTC, these coins are all most fixed and some other sites will use Burst and Dogecoin. You can also exchange your coins in their site. Bitsler has this facility. Don't know how to believe BCH but confirmation and transaction fee is good to compare Bitcoin.
Less and less people are even using Bitcoins in casinos because of the high transactions fees and this has made the altcoins enjoying a field day in the gambling industry. I will not be surprised if that's the reason why the price is constantly rising up nowadays.