I do not think you will place bets with crypto in a physical casino but it will be like you do now you deposit real money and then they give you chips. I think in the future there will be more casinos allowing you to deposit with Bitcoin and get chips in return. They will have to accept Bitcoin if it stays relevant in the next couple of years because otherwise they will lose money.
This thing will not happen if government will not accept bitcoin as their legal tender since physical always follow the government ruling but also majority of traditional casino doesn't know about bitcoin so I expect also that they will not accept bitcoin to use it on their casinos. But let see maybe in future once bitcoin will be notice as good alternative currency and government will vouch its legality maybe this bitcoin acceptance on casino or even everywhere will happen.
Physical casinos are bound by government regulations, because they cannot accept crypto arbitrarily without government approval. Especially if
the government has not legalized cryptocurrencies, it is definitely physically casinos impossible for accept crypto. Moreover, there is not yet a high
enough demand from gamblers for physical casinos to accept crypto, so the physical casino does think accepting crypto is not something to do
right now. I also agree that there are still many physical casinos who don't understand cryptocurrency, so it's true that physical casinos won't
accept something they don't understand. But anything can change in the future, if crypto is legalized more and more in many countries and
governments start accepting crypto as a payment alternative, it will make the physical casino accept crypto too.