On subject matter, I wouldn't say there's been a change in trends. I would say there's been a change from documentaries to series.
Series are more profitable to produce because you can amortize the costs across all the costs, and doing a one-off is more difficult. It's easier for broadcasters to program a series as well.
One-offs are having great difficulty. If you're talking about le documentaire d'auteur or le cinéma d'auteur, I would say they're having even greater difficulty.
I don't know if I'm answering your question or not.