I am not sure whether this was ever answered, but I have been thinking along similar ways.
Until I got my fuji, I hadn't thought about aspect ratio, and with a Panasonic TZ40 travel camera that I used a fair amount for the last 2-3 years, I had instinctively set it to 16:9, so that the images would fill my wide screen TV if I wanted it to.
However, with a fresh flush of photo enthusiasm, I have been processing some of mine using PS Elements. Nice portrait format pictures of tall church interiors in France. But, in 16:9, I'm not getting enough width in portrait more, and I'm just getting tall narrow images.
So for now I'm experimenting with 4:3, as it will give me maximum crop flexibility whilst not losing any image size.
Whilst I appreciate that it isn't 35mm-equivalent 3:2, I am thinking that the old aspect ratio constraint might just be an unnecessary constraint.
Have you been using 3:2?