Yes, I thought I'd provide a little bit of an answer to that.
Really, you need to bake into your business arrangement a relationship and strategic management framework that addresses this, one that says that we are going to measure the performance of this relationship, and not just the performance of the vendor but the performance of the relationship as a whole.
What does that mean over time? You need to align that as time changes. You need to have the mechanisms within your relationship management framework, as part of your contract, to actually do this. That's the answer. That's the right answer.