If they can get out of their addiction after winning, then yes, if not, then no. gambling addicts gamble not because so they can win a large amount of money and change their lives for the better(you can see a lot of stories out there where gamblers win a big amount and lose it all again after repeatedly gambling their winnings), they gamble because they get "high" when gambling, from what I have read, the brain releases dopamine when gamblers experience winning, which can be addictive like how adrenaline can be addictive too.
I don't believe they're many success stories of addicted gamblers. Hoping for a so-called "bright future" is uncalled, it's not going to come any time soon, the most likely scenario is that they'll end up further in debt, trying to achieve their desireable life. However, this is rarely the case, as just like you said, gamblers are after the dopamine rush they experience when scoring a win, and from some point, it's not about trying to achieve the future the OP mentioned. I'm having a hard time believing that many people actually believe they'll manage to score a major win, which would be enough to make a life-changing difference.