Well, Mitch Walding may still have some development potential, at 26... but Phil Gosselin is 30, and Matt McBride is 34 - the same age as Rodriguez (technically, Rodriguez is 27 days older...). Gift Ngoepe is 29.
In the outfield, Cozens (25) will play regularly. Lane Adams is 29, Shane Robinson is 34. If Haseley (23) is at AAA, he, too will play regularly.
I really don't see Rodriguez taking playing time from anybody I might care about. Non-pitchers on the likely AAA roster who I would be concerned about, if they didn't get regular playing time: Grullon (assuming he's at AAA), Walding, Cozens, Haseley (if he's at AAA). I think that's it. Maybe Listi - although my expectation there is pretty low; maybe I'm wrong, but I sense an older guy who feasted at Reading, who is likely turn out to have feet of clay at the higher level. We've seen several of those guys.
Following the Ironpigs this season is all about the pitching.