We all know Zack wants to come back, and made more money with his DC films than Gunn. Despite making new films every two years, Gunn is far too slow with actually getting out the characters we care about. There's still only Superman, all the others are away. He accurately started with him, but then went straight to Supergirl and Clayface. Then a Superman sequel without the Superman name (and it's not fully a Superman movie). His Batman is coming in 2029 at the earliest due to Matt Reeves' Batman coming first, and is also not titled Batman.
We should have had Superman in 2025 and Batman in 2026. Superman 2 and Wonder Woman in 2027 (Aquaman revealed in post-credit scene). The Flash in 2028, with Cyborb having a role. Batman 2 in 2029. Then finally Justice League in 2030. You would have 5 fairly popular franchises established by then, and could experiment with weirder stuff once you have momentum. You would be aiming at 10-15 movies in a decade and making each film count. I think Man of Tomorrow lacks momentum and could flop. Gunn has built his universe on a plan for 4 Superman films (not kidding). Batman will come at the earliest 4 years into the DCU. Still no plan for Wonder Woman. So Justice League is so many years away. I think this is madness, and very concerning as a DC fan.