An all-in-one casino is the trend these days but if you do like a site or that's your favorite then better sticking with it. I believe there's still loyal players these days and for some reason they're rare too. I think it's wise if a site will follow the trend as it's more reliable onto a business and to generate more income. I wouldn't be surprised if Roobet will open up sports betting in the distant future.
All-in-one casinos are not famous because they do it that way, they are famous because they can gather every gambler. Think about it, if you are world's greatest dice website, everyone who wants to play dice comes to you, you are still stuck with only the gamblers who play dice, and we are talking about world's greatest dice place think about it, not some small place, whereas a small place who is 15th best at dice, and 15th best at slot, and 15th sportsbetting, and whatever else, would get a lot more people, why? Because, they are capable of marketing themselves towards a lot more people, and that matters a ton because instead of getting 1000 people from one thing, you get 100 people from 20 things, that is the difference.
So, all casinos are doing this now, plus adding more and more altcoins is another way of this, we used to see only bitcoin, now the more coins you accept the better.