Teixeira has some sock for sure, but his career average isn't all that impressive. Still a tough out. Everybody will have a chance to sign him next year, when he can demand huge bucks and a long contract.
As often happens, batting average doesn't tell Teixeira's full story. Good OBP, very good slugging, lots of extra-base hits. IIRC, he's a Boras client, and he'll be seeking a $200+ million contract in a few months. So at this point I'm sure the Angels are considering him a rental.
It's not so much the lack of a big bat that's the Dodgers' problem right now. It's that too many roster spots are filled with players that are underachieving. Jones especially is a monumental waste. Kent, Nomar, and Pierre aren't earning their paychecks either. This was all predictable. Unfortunately, there aren't many potential solutions other than overpaying for someone or hoping the kids hit better.