I'm not convinced there's a lot of damage to control. The Yankees are signing these players because they needed to replace at those positions.
Just like my argument before the signing, you really do have to look at not just who's coming in but who's leaving to make room.
Teixeira, Sabbathia and Burnett are there to replace the losses of Pettitte, Mussina and Giambi. Bear that in mind. And Giambi hit 30+ HR's and Mussina won 20 games, and Pettitte at least threw 200 IP so these outgoing players are not weaklings or schlubs.
They do make some marginal gains at each position, don't get me wrong about that, but those gains aren't as big as they appear at first glance just from looking at the awesome that is CC and Tex.
The Yankees came in third of the three competitive AL East teams this year and so they paid a lot of money to improve and managed to do so. I don't think there's a lot to see here other than that. If our pitching goes the way it's supposed to I see no reason why the Yankees wouldn't still be looking up at us this season.