I think you make some good points, and I agree with most of them. The one thing I will say about the Entourage DB issue is, regardless of Spotlight, I have an inherent distrust of Entourage's ability to handle large amounts of mail. It's true that I haven't read as much about DB crashes with the current version of Entourage as I had with Entourage X. But on my Mac, it's starting to feel a little goosey, and I'd rather do something now while it's on my terms.
That being said, this is what makes these conversations so interesting, right?