I think that most people will still choose casino where they can gamble with top altcoins and not lose time to exchange to steem, but maybe some steem holders will choose play there.
I think many of them still hold steem and don't gamble with the coin because they have many other top altcoins. But we don't know how many of them who still use steem as the bet. Maybe if they can enjoy using steem but I don't use steem to gamble, and I still prefer to use the top altcoin which is easy to use in the gambling website.
The top Altcoin remains the top choice as their betting coin, well because some well-known gambling sites use the top altcoin on average compared to Steem. Maybe here only gambling players from MagicDice will try to bet with Steem. If we look at some well-known gambling sites such as windice, crypto games, sportsbet, stake and some others still use the bitcoin or top altcoin.
