I honestly will advise him to go for a full fledged online gambling casino, and leave the bitcoin-only gambling casino concept alone, for as far as I know, most people are holding their bitcoin at this time, in preparation for the coming bull run, last thing any gambler wanna do now is spend their bitcoin for gambling, I think I've actually said this before, and here saying it again.
Yes, that's a good suggestion, if most of the other online casinos have gone full fledged then why not L0tt0? I guess Dewez should think about that proposal of yours and he may introduce deposits and withdrawals of coins like LTC, USDT, ETH, DOGECOIN, and a few other reputable coins.
Most users basically want to hold up their BTC investment because the price of BTC is growing very fast and all those players or investors want to earn good profits from it. You're right that those players won't be using their Bitcoin for betting because they expect good returns from their investment.
I guess in future Dewez may introduce more good games but they should also have the same theme as the site. I know it requires creativity to make such games but as far as I know Dewez he's quite good in that department so he can manage to make many such games which should not be similar to the slots games.