Would it be morally wrong to make such a (mostly fictional) movie?
Example: Getting a populace, which already thinks in extreme terms about the future, to view more extreme content about the future, is probably risky and downright unhealthy for a lot of those who will view & then feel increased stress or anxiety
Counterexample: Allowing the populace to exorcise its fear through an affecting viewing experience could be a really good outcome in terms of creating more careful discourse; see for example _Threads_ or _The Day After_
Personally I have to say I lean toward the counterexample, especially if a variety of filmmakers are making different films about the consequences of given timelines. In this case you get a dilution or diversion of energy through varying psychological perspectives, which is helpful in creating systems of nuanced thought.
You can also do this within a single film and this has become a more common way of handling narrative perspectives in modern cinema.
And more generally I lean toward "here's a good way to go about this process of thinking about X" rather than "should we do this X thing" because you can fill the judgment-vacuum with ideas that people can use, rather than simply creating a massive and risky judgment vacuum by casting perceptions of what may happen.
Interesting Q though, you got me thinking.