Thats what I would do, only if we couldn't get anyone of equal value for him. I would love to get Tejada because he is a dirtdog leader that will play everyday and has a hunger for winning. He can fill our hole at SS and could combine with Pedroia to make another Miggy-Roberts combo up the middle. Also, as it has been mentioned, it is far easier to fill up an OF spot than a SS spot.
The only thing with Manny, is he almost has a bipolar type feeling towards Boston and playing here. He wants to stay here, he doesn't, and all of his issues with Boston are easily solvable, but it just hasn't gotten to him yet. Also he has talked about retiring at the end of this contract, and getting Miggy now would substitute for the loss we would get if he did.
Miguel tejada solves more than just the self-made hole at SS but he also:
1) Provides a stable leader
2) Gives you a complete player to man the infield
3) Can teach young players (Pedroia, Marte) how to reach their potential on both offense and defense
4) Gets rid of any Manny distractions
5) Gives a player who can take up the spotlight while humble players/rookies do not have to worry about the media.