The goal is to continue to have waves of prospects develop so the team can sustain success for an extended period of time. In order for them to get into a position to execute it, they had to tear it down. The 3 guys you mentioned were the first wave. The second wave will be Kopech, Cease, Robert, Collins and Madrigal. The wave after will be guys like Vaughn, Walker and Sheets, and so on and so on. Not every wave of players is going to peak at the same time.
They should be good next year. They should be real good the year after. Hopefully they can continue to incorporate waves of players to stay real good for a while. Part of doing that is "playing games with service time."