This is why it's important to have more than one asset all the time. Those who have funds in their casino accounts and those who have other cryptocurrencies apart from Bitcoin are not going to face any issues in such a situation. You could easily deposit a different asset to your gambling account and played with that.
This is the time Casinos and Sportbook should implement internal swap function to allow players swap there coins from one coin to another, what is the point of winning in BTC and you are only allow to withdraw Bitcoin, they should allow people used other options of coins, atleast they are doing their self a favour for having more BTC since players wouldn't be interested on withdrawing BTC and I think that what Casinos even desire the most because it is very profitable for them.
I personally don't gamble much, so I can definitely wait for all this to become normal before I gamble if I ever wanted to. Others will obviously use the method that I mentioned above, using different cryptocurrencies for their gambling deposits and withdrawals.
Since most players prefer Bitcoin as native deposit for gambling, they can also built-in lightening network like the way exchanges are trying to do now, it will not only help players enjoy fees, it will serve as a marketing strategy to draw more gamblers into their platform if they have good reputations and doesn't cheat players.
I remember that Stake does have this function on which there's an internal swap or even of FJ i cant remember on which it is really that good to have, but with having those legal issues which its been attaching about KYC then its been removed. Well, its not really that something a huge issue because most of gambling sites now does have lots of coin options which you could deposit and make withdrawals if ever you do pull out some winnings. Its not necessarily that you would really be converting it back to Bitcoin yet you could simply ask out a particular coin to be withdrawn directly into your non custodial wallet or whatever you do have.
Now is indeed a bad time on making some Bitcoin based type of gambling where you would be making or needing to pay up some huge fees before you could be able to get that fast confirmation on tx
but we know that not all would really be able to afford or cant really deal up with those high fees but luckily we are really that having lots of coin options which it
could really be able to solve out on what you are problematic on.