I suppose it depends on how often you will be videoconferencing - note that the newer XPS now has a centred camera so ‘off to one side’ won’t be an issue. In my limited experience with the machines, I’ve found if you are sitting back at a reasonable distance from the computer and not hunching over it, it looks just fine. A funny shaped screen is ok for a mobile phone, but a serious business computer can do without it. Hopefully Apple will use common sense and leave enough top bezel to continue including it in its traditional position....a reasonable solution until you try and Skype someone on one. They're off to the side, if they ever use the keyboard their hand will almost always cover most of the picture, and there's a slightly unflattering emphasis on their chin.
The couple of people with an XPS that I know both never use the webcam because it's so inconvenient. I'd take a notch any day of the week compared to that (not that I think either are likely on an MBP).