This feels like the serious inflection point for high quality full length feature film productions using this tech.
Now that we have these tools, I don't know but I am absolutely disinterested in it. Not that it doesn't feel right or anything, but I'm just not excited enough even to want to try to materialize some of my "big game" stuff. Closest thing I'd compare it with is like when you pirate a bunch of games and you play none as a result of abundance.
Weird-ass times.
To me, just reducing the cost alone seems secondary, far more important is putting the actual creative and marketing people directly in control of the output. Maybe the end result still gets sent to a pro studio for final production, but letting the true stakeholders directly create what they want could be a killer app. It may also be a terrible idea, like Homer Simpson's car - but that won't stop it being successful.
Also, much of the promotion of these tools come from a population of people unhappy with the current state of the real content creation industry that use real footage and real people because AI movie promoters see traditional media as mainly propaganda machines anyway, so these tools sort help level the playing field.
Coding, for example, seems somewhat benign, because code has to fulfil clear metrics: Either it works or it doesn't. Either it performs or it doesn't. As long as you are able to provide those metrics, you can to some extent treat it as a black box without losing much from a system view (lifecycle, long-term maintenance, keeping things working, broader qualified efficiency like re-use are of course other stories).
But on the other hand, delegating decision-making and thinking to models feels plain harmful to me. I have so many stories around me from office settings these days: "We have to pre-pone meeting XYZ, and we don't have enough time to prepare, so I made this AI analysis <power point deck>". This was then mis-prompted to fit a foregone conclusion, no one has time to do it or capacity to refute a 2000 word slop deck (except by slopping back), and crazy stuff becomes plan of record. This is really going to be a problem for organizations ...