someone who is a heavy gambler will definitely not mind the price of bitcoin even if it drops because in his mind only how to multiply his money, it is very different from traders who think bitcoin only based on fiat value. so in my opinion, the falling bitcoin price has no impact on the decisions that a gambler will take.
Only if that gambler is desperate on taking back his losses. But someone who's still aware of the market situation won't allow himself to do it. The discipline might be gone but when he's eager to have that investment he's holding, the price will make him remember to have a limitation.
But in some circumstances, you're right that a heavy gambler won't think about the price of bitcoin when he's too emotional.
In my part which my gambling funds is totally different from my investment which it is already that allocated but not really that too much yet we know that gambling could really cause too much losses.
Some might be that mindful about market movement and would really be that keen on using some of their coins but since mostly been using btc then we do cherish it much when it comes to its value.
I could say that it wont really be giving much impact since gamblers are prepared on what they would potentially lost whenever they do touch up gambling space.