With the way things are going and how these stable gambling sites are making huge profits, we will have hundreds of e-gambling sites in the next five years now that Cryptocurrency is on the adoption process, it's only a matter of time before the industry will shift to online gambling and the profit from the online gambling industry will be higher than gambling casinos.
We already have hundreds of online gambling sites that accept crypto. The problem is regulations limit where they operate, and I suspect lot of people are still unwilling to use cryptocurrency due to volatility, especially with Bitcoin recently. I could definitely see a continuing shift towards online gambling, but not necessarily with cryptocurrency involved, though I'm sure online gambling sites primarily focused on crypto will still keep growing.