Disbanding the Syndicate was the only way to avoid wars and assassinations against the Ross Syndicate. If there was no syndicate, nothing would happen. It was indeed a harsh solution, but it was also the safest one.
The only thing Rusher cared about was protecting his family. He had given up on the Syndicate a long time ago, so he wasn't against the idea of disbanding the Ross Syndicate.
The remaining members discussed between themselves and happily agreed to Ruby's decision.
After that, Ruby informs her family that she is leaving with Maria and Rudy. At first, Nyara was against it, but she reluctantly agreed as she knew Rudy was the best person she could entrust Ruby and Maria with.