I know a lot of us here would say we should be gambling for fun, but in reality most people don’t gamble just for fun, they do it mainly for profit.
People have their own right to gamble for fun or for money. There is no pressure to gamble for a specific purpose. So, basically we can't generalize it, we also don't have certain data whether most people really gamble for fun. If you refer to the statement of most forum members, it doesn't reflect the real number of gamblers in all casinos. There are many gamblers who are never involved in the discussion in this forum.
But what if people stop aiming for profit and gamble only for fun, what do you think would be the impact on the gambling industry?
IMO, even people gamble for fun, they also expect to win the prizes (money). There is no gamble who never expect to gain money, whether gambling for fun or solely for money. The difference is gambling for fun doesn't only focus on earning money but also enjoys the process. Meanwhile people who gamble solely for money, they don't care with another thing.
Will we still see it growing or will the industry shrink?
As long as many people are involved in gambling, there is no way of the possibility of "the industry shrink".