Anonymity and popularity of Cryptocurrency are two of it's the best attraction.
And Cryptocurrency games are more transparent.
Will, there comes a time that all online gambling sites will be Cryptocurrency based?
In time, all online casinos will integrate cryptocurrency in their business. Both fiat and crypto have their pros and cons so keeping both of them letting their customer decide will solve the problem. In my opinion, fiat and crypto can be used both by any industry depending on their customer and transaction with their suppliers.