I'm NOT cracking a gag! In the same way Nolan thinks it would be offensive to the memory of Heath Ledger to have certain parts cut out revolving around The Joker in TDK, I think it would be offensive to the world stunt community to have a money stunt shot left unused in a James Bond film...and in this case it wouldn't even be a posthumus inclusion. The driver is alive and i'm sure he'd want the shot included in the film if, indeed, it was a legitimate take and the cameras were rolling.
The difference here is that Heath Ledger had already died when reports came about that the Joker would smuggle himself into wherever it is inside a body bag. Here, the stuntmen were just involved in an accident during filming, and going by MkB's description of what happened, while it may well be a legitimate take, the scene was supposed to happen in a completely different way. I think it would be somewhat callous of them to write the accident into the script after it was caught on camera.
If ever you've seen the film
Alien: Resurrection, there's a scene where Ellen Ripley throws a basketball half the length of the court or more without looking and gets it in. Sigourney Weaver apparently got it on the first time, but before the director could call cut, one of the other actors turned straight to the camera and said something along the lines of "Did you just see that!?"
The reason I bring that up is because everyone would have been standing in their designated safety zones for the stunt, but as soon as it went badly, people would have been all over the place making sure the drivers were alright - which they weren't - and getting help in. It's likely that the camera was still rolling, but there would be people all over the place. Dan Bradley couldn't rightly say "Wait, this looks good for the film; no-one go near it for thirty seconds while I get some shots of the wreck!" There were lives at stake, and in that kind of situation, moving quickly is what saves lives. The sooner they got to the car, the sooner they could assess how bad it was, which mean the sooner they could contact help. A rolling camera and visual appeal in the final film would have been the last things on everyone's mind.