Actually this is a hard situation for gamblers whom do really make use of bitcoin because they would really be needing to deal with the fees.
But there are options to choose but that gambler must have other altcoins to save the fees.
And the other condition is that the casino must be accepting different alts. The fees really are quite of a pain theae days but there is a way and alternative.
This should not be a big issue now because almost all of the casino offers more altcoins to gamble with along with bitcoin. If anyone cant afford the big fee of bitcoin or ethereum, they can use dogecoin or litecoin to deposit and gamble. Also after bitcoin have reached all time high, people prefer to gamble with cheap altcoins more often then with bitcoin.