I guess there will still be a way of gambling even if it is not introduced in the past. Since there are sports, a way of having a competition with other people, there will always be people betting on each teams with their money supporting that certain team but of course, that will not be called as a gambling act since no one knows what it is.
Yeah, I think there is really no way that gambling won't be introduced/invented in this case. Might as well never bother to think of what if's and what not about the invention of gambling, because it will really waste much of our time