If you aren't reading Johanna Rothman's Hiring Technical People, you should be. Here's an example:

Hiring Mistake #2: Hiring for the Future, Not the Present

The second biggest hiring mistake I see is to hire for the eventual future -- but not to create the future from the current reality. I see this mostly when hiring managers and senior staff.

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Creating a new future is difficult -- possibly the most difficult position a new hire can be in. Hiring managers need to balance the need to create a strategy and act on it, along with the tactical deliverables they already have. Finding someone who can meet the current needs is more important than hiring someone who can only perform the future role. You mguth even need two different people, one now and someone else later. (But maybe you can coach the person into performing the eventual role.) Always make sure you hire the person who can create the future by working in the present.