Travel and tourism industry is the worst hit due to the current pandemic. Since people are not allowed to travel and the transport of all sorts are closed, Las Vegas and other places known for tourism and gambling, are facing the heat! But travel and tourism industry is not an exception right at this moment, all industries are literally bleeding and there's no silver lining in the sky!
People will come back to gamble only if they have employment that pays well. Since that is not the case at this moment, gambling industry is also facing the heat! However, I am not that pessimistic about it. The scenario will come back to normal most certainly - but it will take some time. Post the pandemic, the consumer market should first come back to normal. Once the companies see demand in the market, they will be producing goods and employing people. That is when the money will start circulating again within the economy and the economy will slowly come back to track.
It will take time for sure. Rome was not build in one day and it will not fall due to an epidemic!