Hi, the cat!
I really want to see multiple major winners among the top players - no flukes please. As a fan, I would like the unpredictability. But, of the three you mentioned, Andy seems most likely to pull another USO or an AO before the other two for the reasons bunk stated.
I'm still holding out hope for Hewitt to stay in the fray and Nalbandian to finally clinch a major. He's a contender on all surfaces. As much as I hear commentators talk about David's mental strength, I don't feel that he believes he can really get a major trophy. He always comes up just short. Now, he's dealing with health and fitness issues and I don't know how those will affect his confidence.