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.