Football is sport that has really been attached to and is loved by everyone from various countries with any background, after all, no matter how bad the problem is and no matter how complicated the conditions that occur in football, it will not have global impact.
Moreover, every problem will always have solution and in football there are lots of problems that occur but up to now it has never affected anything globally that would cause ban on this sport.
Do you think gambling/casinos will lose it popularity since chunk number of their clients are from sport bookies section?
There is no doubt that casinos will lose gamblers but I doubt they will lose popularity. Gambling is a big industry while sports betting a very popular market it is not the entirety of gambling, there are other types of gambling games than sports betting that gamblers likes/love to play. also, if you hypothetical scenario did happen, pretty sure those sportsbettors will find an alternative to sportbetting.
It is important to remember that none of this will happen, if it does, perhaps only in certain leagues or competitions and not as whole.
In addition, sports are not just football because there are various types of sports listed in sports betting, so if there is problem in one type of sport, there will still be other sports options.
Popularity and volume of the gambling industry will never be affected, and I think this kind of thinking is going too far, having the idea that global problems with football would cause ban is ambiguous.
Yes, you are right, there will always be other alternatives in gambling that allow gamblers to still bet and have fun.