As others have said, if I'd come home with that image I'd be just plain happy with it and format be damned. The itty-bitty little negative might limit how large you can print it comfortably, but it seems like an image that will work well in a medium-sized print too.
Once in a while I've had that experience of saying "dang, I wish I had a view camera for this", but there it is---you just can't be ready for everything all the time and I try not to worry about it. I bet Niepce would have loved to have a Master Technika and a holder of TMX to shoot those rooftops with, but I'm glad he didn't pass up the shot for lack of them.
-NT