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?
I guess
not all gambling sites will make their's to be crypto-based.
There might be a lot of them that will consider it and might even do it, but not all gamblers are using cryptocurrencie, so there will still that will remain to be fiat based.
Ofcourse even we are at the time when cryptocurrencies are rising, still, there are people who prefers to use fiats.
I actually have some friends that do not want to open theirselves up on these cryptos. And we should respect those people.