right, but you have to agree that it would be pretty sick to have a follow cam for butters and such. I agree that super sketchy big mountain lines are just too gnarly for good filming. However, there are definitely some ways to get around that. Look at TBC where the cameraman is following mike wilson side to side, down a moderately steep slope. I think that with an already paved out path a cameraman could bomb down switch with the camera looking backwards, it could work out brilliantly. It would be sketch though, you'd have to have a very long flat runout for the cameraman.
However, I really don't have the skill to do that while filming a screaming fast line. I do think that filmers with the caliber of Jon Hatveit do though, and it could prove to be pretty damn sick.