Did you notice De Aza's line vs. RHP this year in AAA?
97 AB .330 Avg .425 OBP .485 SLG
7 doubles 1 triple 2 HR's 11 RBI 14 BB 14 SO 8 SB 0 CS
Last year at AAA in half of a season, vs. right and left handed pitching:
267 AB .300 Avg .370 OBP .506 SLG
21 doubles 5 triples 8 HR 34 RBI
Add his good defense, and you get a pretty compelling player to consider to take Pierre's place.
If he can perform anywhere near that level, you can then try to move Pierre in the off season, and get some salary relief to be applied toward other needs.
What's wrong with giving him a chance to show what he can do?