I went through the 40-man rosters and made a list of all the guys who are sub-5'10". There's some talent there actually. If Torreyes were on the Reds 40-man today, the Reds own DRH (shortest player on a MLB roster) would be the only man shorter. Herrera is also only one of two pitchers listed as below 5'10". The Pillies actually start two sub-5'10" players in their everyday lineup - Rollins & Victorino.
The moral of the list below, IMHO, is that if Ronald can grow and inch or two in the next couple of years he should be fine. Although I submit that sports teams of all kinds are notorious for fudging heights and it would not surprise me if more than a couple of those listed at 5'8" weren't actually closer to 5'7".
Brian Roberts S-R 5'9" 175 (BAL)
Cesar Izturis S-R 5'9" 180 (BAL)
Dustin Pedroia R-R 5'9" 180 (BOS)
Eduardo Escobar S-R 5'8" 160 (BOS)
Omar Vizquel S-R 5'9" 175 (CHW)
Will Rhymes L-R 5'9" (DET)
Jarrod Dyson L-R 5'9" 160 (KC)
Alberto Callaspo S-R 5'8" (LAA)
Maicer Izturis S-R 5'8" 170 (LAA)
Alexi Casilla S-R 5'9" (MIN)
Ben Revere L-R 5'9" 175 (MIN)
Chone Figgins S-R 5'8" (SEA)
Mike McCoy R-R 5'9" 175 (TOR)
Tony Abreu S-R 5'9" (ARZ)
Matt Young L-R 5'8" 175 (ATL)
Daniel Ray Herrera L-L 5'6" 165 (CIN)
Jonathan Herrera S-R 5'9" 150 (COL)
Humberto Quintero R-R 5'9" 220 (HOU)
Jason Bourgeois R-R 5'9" 190 (HOU)
Dioner Navarro S-R 5'9" 205 (LAD)
Jamey Carroll R-R 5'9" 170 (LAD)
Rafael Furcal S-R 5'8" 195 (LAD)
Michael Martinez S-R 5'9" 145 (PHI)
Jimmy Rollins S-R 5'8" 170 (PHI)
Shane Victorino S-R 5'9" 190 (PHI)
Alex Presley L-L 5'9" 180 (PIT)
Jarrett Hoffpauir R-R 5'9" 190 (SD)
Luis Durango S-R 5'9" (SD)
Mike Fontenot L-R 5'8" 170 (SF)
Miguel Tejada R-R 5'9" 210 (SF)
Darren Ford R-R 5'9" 190 (SF)
Andres Torres S-R 5'9" 190 (SF)
Nick Punto S-R 5'9" 190 (STL)
Atahualpa Severino L-L 5'9" 170 (WAS)
Ivan Rodriguez R-R 5'9" 205 (WAS)