Even if vaccines are available, IMO, it is still not advised to be complacent, there are issues that vaccines could have side effects or could even make the scenario worst if not tested well. Particularly the dengvaxia which endangers the people who took it as having more risk to be more vulnerable to infections.
That's why it takes time for the vaccine to be release because they have to study it carefully, remember, we are talking of millions of people who will use these vaccine once it's out, it's different from the cure as vaccine is use to prevent people from getting infected.
One other thing that might happen is that, if these vaccines became approved in the market, people will feel safe, leading to more covid cases and making things worse and the supply of vaccines might not be enough.
I'm okay with these casinos being open as long as people will still take precautionary measures to ensure safety.
It will not lead to more cases since once a person is already vaccinated, he will not anymore be infected by the corona virus, that's what I understand, it's like a protection against the virus though virus will still stay, that's why its necessary for every one of use to get this vaccine once out.