The world will feel bland if gambling is not introduced, maybe we will work very hard to get money,
They will not feel anything about it because just like the question said, what would happen if gambling "was not introduced", how come that someone would react on something if he doesn't even know it in the first place, it is kind a confusing or weird if you are something like that. And even without gambling being introdude in this world, for sure people will work hard to earn money to buy their everyday needs, and right now, even gambling exist, people are still working off their butt to have some money to pay their bills.
I think there will be a new kind of gambling activity if gambling is not introduced in this world.
and this is confusing also, how come you said there will be a new gambling activity if gambling was not introduced, now I'm puzzled about this, lol.