Oda has the chance to save this arc in a Loki/Luffy/Gaban/Zoro/Sanji vs Imu all out battle.
But if Imu don't come yeah, this arc would feel lackluster. Like we go from fighting 2 yonkos, to 5 gorosei to freaking Holy Bums? (And take away from us the most interesting one of them BTW [Shamrcok]) In the most hyped arc after wano?