> It's worth noting that currently, the technology doesn't even exist to say "hey, I just had an idea, let me just write a full novel about it really quick".
That's one of the first problems I've ever tried to solve, back when I was writing chat bots. Fortunately, building a robot that can write human readable text from structured data, is many order of magnitudes easier than building robots that does the opposite. Pattern recognition is what's keeping current chat bots so dumb. But we actually already have some really good bots that write text reports. You probably already read news/sports reports written by bots and never noticed.
I believe that's the way for future tools. Users give very basic structured data (who's the protagonist, what does he do, did he die at the end?). And robots transform that data into text, movie scripts or whatever.
> Even designing a tool allowing a person without experience to come up with camera angles and sequences
You don't need to do that. Bloggers don't need to understand HTML nor CSS. A good tool would give higher layers of abstractions to choose, which were designed internally by professionals. And the user shouldn't even need to know what good angles or lighting is.