The bigger problem with moving people over to a dependency on AI is you're reducing creativity within the community. In the longterm you're reducing people's creative ability level and creating a dependency on the tool.

I would not be surprised if this has other adverse effects too. For example one of the major driving forces within Tabletop Games for community interaction between players is DMs speaking to other DMs to share ideas, creative ability, talent, and improve themselves as DMs. It's a skillset that is communally spread, learned and ideas bounced around between people. Even in this thread there's a DM taking an idea from another DM.

You offload this to AI and you are actively killing reasons for humans to interact with each other. Now this MIGHT form a different kind of community, if you're lucky. There are still artists who create real art who communicate with each other in communities and help each other grow - and then there are bazinga AI communities who all share with each other how to bazinga the AI into hallucinating the end result images that they want. That's two different kinds of community, so maybe that will be how it goes for something like this. The question is whether you actually want that or not though.

Do you need to materially wear out a $5000 GPU for that? I'm pretty sure there have been books full of "roll some D20s for random encounters/scenes/etc" for years.