Dear Tom (and all) -
Here's a suggestion as to another line of bags, similar to ones you make now: Domke, the legendary camera bag manufacturer, has been run into the ground by a company called Saunders. While it looks like they will continue to make their classic (boxy) camera bags, they have discontinued the camera satchel / briefcase line altogether (or so I've been told by the person I called there).
The best of the lot for all-around use (day to day, travel, photo shoots) was the F-805. You can see the 805 (and other satchels) here:
It's not too far removed from your Cafe bags, just a bit bigger and a few more pockets. Something like this - 15-16" wide, 6-8" deep, and about 12" tall, with the appropriate pockets and snazzy aesthetic, might be quite a hit. The genius of Domke bags is that they aren't padded all around like other camera bags (which become bulky, inflexible boxes on your back). Domke instead make a range of padded inserts which velcro into the bag, and can be taken out and rearranged as your needs warrant. It can go from camera bag to clothes bag to shopping bag easily and quickly.
In any case, I think this is a market with potential. There aren't many other bags like this at all. And it's a very versatile design. So I throw the idea out there. I have some design training, and would happily donate my time to help with any part of the process if there was interest.
Best wishes, thanks for the quality work -