I think the writing was on the wall of Brooke going last season. When they went to one night and had to get rid of the waiting room there was no longer a reason to have Brooke. It was too awkward to have dancers talk to Tom, then walk 10 feet and talk to Brooke. With the dancers sitting at the floor they only need one host. Perhaps that's why they got rid of the band too. Without it, they can reconfigure where the dancers sit and allow more room for the studio audience.