The “John Wick” universe just keeps growing. What started as a simple story about a guy trying to avenge his dog’s death has evolved into a sprawling mythology about a secret society of assassins who operate under the rule of an all-powerful oligarchy known as the High Table. And the bigger the franchise gets, the more room there is for A-list actors to join the fray. With Halle Berry and Ana de Armas joining the “John Wick” ranks in recent years, it seems like the sky is the limit with regards to potential future castings.