Of course there could be some changes to fee structure both on casino and for blockchain in general as well, for example if you pay a lot of fee it will pass much more quickly, if you do not pay any fee however it will probably comeback or will take days to reach. Hence long story short maybe windice could have a fee structure like erc20 tokens where you pick "fast,normal,slow" options and choose how much you would like to pay or even manual. I feel like it would be useless workload and we don't need it but nobody would mind having it neither.
Yap, you are absolutely correct. Instant withdrawal is about the time when the site process the withdrawal, instant withdrawal usually uses automatic system with no need of verification/confirmation from the staff first. On the other hand, manual withdrawal takes longer time because the staff needs to verify the request first before processing it.
Of course instant withdrawal will be better if the fee structure is good enough, so the withdrawal will be confirmation as fast as possible based on the network. Indeed some people still think wrongly, because some people thinks that instant withdrawal is about how fast the withdrawal is confirmed by network.
But still if in the end money will come to your wallet then why bothering about this instant and manual? If it is manual then you just need to wait a longer time compare to the instant. I do not understand why some of the players need to get his money as fast as possible. Lets say of you want to do the trading when its price is surging then with a little different time then it is not a big deal