Should that happen, bringing Sears back as Black Flash would not only make sense, but seemingly be necessary.
The Flash currently has four speedsters on the show: Barry (Grant Gustin), Wally West (Keiynan Lonsdale), Jesse Quick (Violette Beane), and Jay Garrick (John Wesley Shipp).
The possibility of Black Flash returning at some point is an intriguing premise for the show to try and tackle as he primarily appears right around the time of death for a speedster, in the world of DC Comics.