Much like their big-screen cousins in the Marvel Cinematic Universe, the CW’s small-screen superhero slate is also approaching a significant crossroads in its storytelling. Where the MCU had Avengers: Endgame, the DC TV universe has “Crisis on Infinite Earths,” the upcoming Fall 2019 CW crossover event which will not only adapt one of the comics’ most famous stories, it will help bring the franchise’s very first property to an end. When a little show named Arrow premiered back in 2012, pretty much no one could have possibly imagined where it – or the entire television universe it …