They should always be looking to improve the organization, including PD, but so far, the Pitcher Development under this F/O has been pretty decent.
Consider the cases of Stroman, Syndergaard, Norris, Graveman, Nolin, Sanchez, Nicolino and I think you should feel more at ease than you do.
There's also good stuff being shown by guys in the lower minors, specifically, the strides made by Smoral this past season which could be comparable to Norris's 2nd half in 2013.