The DH is here, possibly to stay, and no position group on the Giants roster will see more changes because of that rule than the outfielders.
The two men who were supposed to split left field, Hunter Pence and Alex Dickerson, now could soak up many of the DH at-bats, which could have a cascading effect. Perhaps Darin Ruf now makes the roster as a DH/left fielder/first baseman. Perhaps this leads the Giants to finally sign Yasiel Puig, the best remaining free agent, and stick him in right field on a nightly basis.
Farhan Zaidi, Scott Harris and Gabe Kapler have 16 more days to figure it out.