For B-Roll it's different. I can somewhat see the why behind that. It's just to give your brain something to look at so that you don't have a voice-only podcast.
But movies OTOH are these creative endeavors where the shots _are_ the content instead of just augmenting the content.
This won't stop the industry from still trying to use this tech like that, of course.
I mean, if you just want to claim that AI lacks soul, and its an abomination if every frame in film isn't make by a chemical process involving silver nitrate, like the good Lord intended, that's fine. But there are certainly film makers who don't share that sentiment.
I would rather expect people to use AI to drive more conventional VFX tools, as that is reproducible, can be versioned, and, most importantly, will contain true intent in aspects.
Something this simply cannot do.