I think that conditions changed after thiis pandemic happened. I.mean not just in casinos and night clubs but elswhere in all indoor spaces. They need to obey much harsher hygene and health measures and that is for good of all of us. Although I can understand that for long time sone people will stll avoid places like casinos.
The problem is also that air travels from abroad are still fairly limited, going by car seems fine and being in big casinos with a lot of space for social distancing it's alright. But being in an airplane for hours with plenty of people fairly close around doesn't seem so clever. Unforunately there is no distancing on air planes yet - I would definitely avoid flights as long as possible. I think some airlines even stopped completely to fly to Las Vegas during the pandemic.