Since you state that one can pay for chips or tokens with Bitcoin or fiat currencies, the impossiblity there is been erased.
So therefore, betting offline with Bitcoin is very much possible and can be practised in any offline casinos, cause its more like paying with it like the other currency.
The one thing that any casino owner, who wants to implement the use of BTC in his casino should look out for is if Bitcoin is legal in the country where is is sited. And also obeying all regulations abiding with it to avoid sanctions.
That's right, buying chips in the casino through Bitcoin using online transaction is possible. So if the casino will implement this kind of payment, then betting with Bitcoin through traditional casino could be a reality. The question is, does the casinos will take this gamble of having a volatile means of selling their chips?
About on casinos measure towards the volatility of crypto then who knows but for sure they are pretty aware with that.