Bitcoin transaction fees is starting to get more and more expensive for gamblers to deposit into their account on gambling sites, so I believe the market for altcoins will grow bigger in future on the gambling community, and we can surely expect to see more players wagering with altcoins.
In altcoins market we have a lot of choices and I hope more casinos will accept altcoins so it will give us a chance to gamble all the time.
Bitcoin is good but not this days due to the transaction fee and you cannot just bet small amount as the fee alone will already kill your bankroll, still majority are accepting only bitcoin but sooner they will realize that it will attract more customers when they start accepting altcoins.