I think if they were new they wouldn't pay much attention to the ups and downs of the price, because basically they would focus on the stakes and not on the price on bitcoin. But indeed, the decline in the price of bitcoin will not affect the overall bet because every gambler and player certainly has its own way and calculation for them to hold, withdraw and deposit. So far the price of bitcoin has experienced a lot of decline but in fact there are not many gamblers who complain about it and also, not many of the developers are bankrupt, because more of them survive and continue to grow over time.
I don't know about anyone else, but for me it won't have any impact. I don't bet with bitcoin, but more likely to do with other currencies like stablecoin or others. The impact of bitcoin's decline only leaves me with the opportunity to earn more bitcoin if I win, but the opposite will happen if I use stablecoin.
Big gamblers in the crypto space don't really care about price volatility, but they only care about how much assets they have in crypto so the lower the bitcoin price, the more it appears they are trying to collect more by gambling.