No shit. He has a 142 OPS+. Even considering what offense is lost due to his defense they aren't going to be able to replace him.
Regarding trades, I hear the that if the Braves were to trade Teixeria to the DBacks they would want Conor Jackson back.
Code:
Conor Jackson Jul 18, 2008 to Jul 27, 2008
G PA AB R H 2B 3B HR RBI BB BA OBP SLG OPS
+---+---+---+---+---+--+--+--+---+--------+-----+-----+-----+
9 42 37 13 19 2 1 4 8 5 .514 .571 .946 1.517
I don't think so.