If someone wants to copy the Brewers' "Moneyball 2.0" style, it will take time. One of the core tenants is building up the minors and developing from within. Sprinkle in a few veterans to help.
Also throughout this entire process, Pitching has been a top priority. Start on the bump with starters and the bullpen.
I have a feeling a lot of fan bases will try to get the talented free agent and expect an immediate turnaround. That may or may not work. Moneyball 2.0 is a process.