>>329696
I'd be totally game for that, but it would require too much genuine knowledge in too many fields, which is why we haven't seen it. I'll explain. You mean like an entire ecosystem down there, right? Why should only humans be the ones to slip through cracks in reality into The Backrooms? Animals should easily be able to get in there, and so should plants (technically).
Let's lay down some ground rules for this.
1. The Backrooms is unconstructed phase space that manifests into a single form only under observation.
2. "Observation" means not just humans actively viewing it, but also other animals. Additionally, the mere presence of plants counts as observation (from a quantum standpoint), as does things like human alterations to–or impositions upon–the environment. A surveillance camera set to look down a hallway will never see that hallway change. Its observation prevents that. Furthermore, lines of tape on the floor to mark plotted paths will also never change, because that tape alters the quantum state available to the substrate.
3. The Backrooms only manifests as the appearance of a human-created structure. Office space, pools, grocery stores, warehouses, etc.
4. Humans aren't the only life that can fall into holes in reality to end up in The Backrooms.
With these rules in place, there should be thousands of cubic miles of it that are forced into a static appearance but also completely covered in foliage. Plants being there means that an entire ecosystem of animals can survive there, too. Let's start with a "seed" population that is a complete cross-section of life in a biome. Sometimes individual bugs or animals will become visually separated from the "constructed" part of The Backrooms, which lets it 'shift' them somewhere else. Without food and/or water, they eventually lay down and die. Since environmental conditions are static and sterile, they'll eventually just be mummified corpses. When that section of The Backrooms is reconstructed, say by a human research team, they'll come across this lone animal corpse. That's interesting in and of itself.
But let's take it a step further. Who says time moves at the same rate in The Backrooms as the outside world? There have been videos in which someone falls in, walks around for a while, and then comes a cross a room full of "Have You Seen Me?" posters, one of which has his picture on it. An entire self-contained ecosystem, left alone for, say, TEN MILLENNIA in The Backrooms (even if it was 10 minutes in real time) would create an entirely shifted set of "monsters" (living things, by your suggestion) with which humans who fall in (or corporations that open a doorway) would have to content. That's fascinating and I'd be all for it.
But it requires intensive knowledge of anthropology, botany, biology, ecosystems, r/K theory… most people just want to make Huggy Wuggy-tier bullshit.
>>329698
>No monsters means nothing more is done with the idea.
Nonsense. Even assuming my "rules" above (but removing the ability for anything but humans to fall in), The Backrooms represents a huge resource boon, a massive geopolitical shift, a threat to global security, and a complete dismantling of the scarcity economics which drive the world today.
Imagine The Backrooms is sterile. No "monsters," no animals; only humans. Neat. Now we have an INFINITE GARBAGE STORAGE. No more worries about biological or nuclear waste. Throw it into unconstructed phase space forever. Oh, but we also have INFINITE HOUSING, too. No more worries about lebensraum. And we have INFINITE MATERIAL RESOURCES. Not all forms of resources, of course, but anything that The Backrooms can generate is infinite. Poolrooms means infinite water. If we accept the grocery store level as canon, that means infinite food, too. Governments would have to keep it very clandestine or their economies would collapse overnight. People would be clamoring for entrance into infinite food land.
Who says only one nation has access to The Backrooms? Who says the doorways are particularly far apart? Why not sneak into another nation by breaking into The Backrooms, doing some hard math, walking to a specific location and building another doorway INSIDE it to break into another nation from "underneath"?
Without "monsters," it's an entirely different TYPE of horror setting, but it still has a lot of potential.