The injuries will catch up to the Yankees. Teams often get a short-term boost from these situations because everyone senses a feeling of urgency. But losing front-line players eventually catches up to you. The Cubs and Derrek Lee come to mind. But I will say that the Yankees needed an infusion of youth on their roster. Look at the past four or five teams to win the World Series: They were not loaded with players in their mid-30s and older. Teams like the Yankees and the Giants were breakdowns waiting to happen. Don't forget, the Yankees' money also gives them an edge in the international market, where they have signed such "homegrown" players as Orlando Hernandez, Alfonso Soriano, Chien-Ming Wang, Robinson Cano, Melky Cabrera, etc. Their draft picks have not worked out nearly as well.
I keep thinking that Soriano will wind up back in the Bronx before the summer is over.