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I think the bezel thickness has to do with proportions at the bottom of the screen. If you look to the bottom, the space is the same all around the side and top (or pretty close). If the bezel shrank, then the monitor would be closer to the bottom. The less bezel equally around, the lower the screen and closer to the keys.
I bet the reason the bezel is so big (other than to ensure the camera had enough space at the top) was to equally provide enough space at the bottom to keep the monitor higher up.
Guess they could have made them look like iMacs and had more on the bottom then the top or sides but perhaps it looks imbalanced or uneven or ugly.
Thoughts?