If they are both able to earn their own money, I think they can both continue to gamble. They can also share household expenses. I think there is a possibility that both of them might get out of control, but it is not a sure thing, and both of them can manage to act responsibly. I don't think it's right to have prejudiced thoughts against this imaginary couple. 
Well, I find this very difficult to resolve. We cannot force a person to quit gambling. While we are gambling. If economic conditions are good and both people know how to control themselves in gambling and have a lot of free time. Both could use some time to gamble. If either of the people has an addiction and a difficult economic situation, I think both should quit gambling. We cannot gamble in front of people who are addicted to gambling, and they will not be able to go through rehab.
Let them determine their own path in life, meaning whether they are good or bad at gambling, they are the ones who judge and if a husband and wife enter the world of gambling and they enjoy it and it doesn't even become a burden on their family then what's wrong with them gambling?? And it must always be remembered that husband and wife as gamblers must cover up this behavior as much as possible in front of their children so that their children do not follow in their parents' footsteps.
However, gambling is a bad behavior in life and not everyone can control themselves well when gambling.
If a husband and wife are already gambling, enjoy it together and maintain good control and always be careful in every gambling game they play.