If Varitek's going to be out a month, by the time he's back the rosters will have expanded so there's room to carry all 3. Lopez is also a free agent after the season so there aren't any long term issues with the move. I know he's not the player he used to be, but when the alternative is Mirabelli/Ken Huckaby it's a no brainer IMO.
My bad. I misunderstood what you were saying. Not that I would complain if Varitek quit on the Sox, but I would have an extremely hard time believing it.