I wish this could happen soon. Clas royale is one of my favourite games based on P2P model. If gamers can come out with such a game where people can bet Bitcoin for every game they play then it would be fantastic. In the meantime you can try arcade based gaming sites like saltybets or betroar to play with your Bitcoins.
I Don't think it will happen soon, because blockchain games are like still kids, I am saying it because I haven’t found any good graphic big games where I can earn bitcoin by competing others! I think Dapp idea not working for big games like Pubg, Royal battle! All the dapp almost same, no revolutionary game yet. But I believe it will happen in this decade,!