Well we already got Wally on the Flash show. I don't know what you think of the adaptation but I'm not happy with it. I'm not sure if it's because of the actor or the writers, but he has a serious lack of charisma, especially for Wally West and especially compared to Gustin's Barry Allen. Live action appearances are more valuable than animation so between the show and the upcoming films, Barry is light years in the lead. He's also got Justice League Action, the animated films, Injustice 2, and almost all Flash merchandise. Its safe to say Wally is left with Barry's scraps.