It may not be the answer fans of Mark Hamill’s scene-stealing villain The Trickster want to hear, but it is nevertheless the situation at hand.
One crucial part of Todd Helbing’s answer to TVLine regarding a Mark Hamill reprisal is that he does want it to happen.
One brother’s loss is another brother’s gain.
With the strong possibility that The Flash could zoom towards a sixth season following its latest, it stands to reason that Hamill could eventually reprise the role, either in an upcoming season or sometime before the end of Season 5.