Aggie's very practical answer makes the most sense. I have a cracked darkslide for the 8x10 that I have been meaning to make into a 4x10 slide, so I have already thought about making sheetfilm panoramic.
The reason for the rollfilm question is that there are some films that just don't come in sheets, and I got the 6x12 rollfilm back specifically for that reason. I use Pan F and D3200 sometimes. Ed Buffaloe's site shows pyro times for D3200 that really do make the film great at a higher speed than any sheet film that I know of can attain. And since most of my work is portrait work, speeds are always an issue.