I just hope we don't give up on Newcomb and it become an Arrieta situation. Patience costs us nothing.
Teams can't keep guys in the minors forever. At some point they must be given a chance at the MLB level, and a team in contention often can't afford to give a guy unlimited chances to "figure it out".
Arrieta wasn't good until 2014, and the Cubs were bad in 2013/2014, so they could afford to let him "figure it out". This is what the Braves should currently be doing rather than paying Dickey, Colon and Garcia $30M to give a non-contending team mediocre innings.
If the Braves are still awful by the time Newcomb is 28 like Arrieta was, the rebuild will have already failed miserably and there will be new Johns in the FO.