I see three potential rookies with actual upside potential - Brooks Lee, Emmanuel Rodriguez and Luke Keaschall. If they want to give playing time to develop those guys, then I'm okay with the decision. Betting on Helman, Keirsey and Martin is a loser bet.
They never give a straight answer (so they can't be held accountable) but the plan for the infield appears to be 3B Lee, SS Correa, 2B Lewis, 1B Miranda. UT Castro. I'm fine with that if they add a good outfielder so they're not using Julien as the everyday DH.