Casinos will always give in to the gambling community, if there are better options at other casinos that do not accept CBDC then gamblers will flock to those casinos, online casinos are both entertainment portals and business entities, it's the gamblers that make the money coming in, they can include CBDC but never to the point of replacing Cryptocurrency, there's no way the gambling community will part ways with Cryptocurrency and accept CBDC that's giving away privacy and letting them get tracked, there will be casinos that will not accept to what the government imposes on them.
I don't think that Casinos will prioritize the gambling community over the regulation. After all Casino operations are bound to the government regulation. So I think that they will give in to the gambling community as long as :
1. It does not breaks the gambling regulation implemented by the government.
2. It will not cause lost to their gambling platform.
After all, casinos are businesses that is created to make profit, and avoid problems on government regulations. So their main priority is the compliance and profit. I would agree, that if CBDC is not yet fully required to be implemented by casinos and there is an alternative, casinos will take the middle path that will not oppose the regulation and at the same time give benefits to the users.
About gambling community, they are already established even before cryptocurrency is created so we might see other community parting with cryptocurrency usage if the government pressure casinos on removing cryptocurrency option in their fund deposit. In the other hand, it is obvious that crypto enthusiast will always choose the option of using cryptocurrency to protect their privacy and may look for crypto friendly casinos to play.