I'm there with you E...
And your point about "dio" vs. "Playset" is big... I personally prefer "dio" myself, but that's not to say I don't appreciate playsets. I have my Bespin one, and I was one of few who didn't bitch about that thing. I love it. I want to expand it, but I love it as-is, as a way to display my Bespin guys... It makes them a billion times more interesting to look at, but that's just me. I even enjoyed the goofy spandex block and "freezing" a figure.
It's far from a dio, but has a little of A & B mixed I think.
I like the realism of a dio piece, but I have a hard time seeing the point of endless hallways as a system of anything but a backdrop for your figures. Kids won't want that, adults barely do... The people who do are the guys who want something interesting behind their figure.
I am not opposed to 3D printed stuff, but I also have self-taught how to do my on work on that and you just need to know someone with a printer, or use an online one, to get that made... Had a hard time seeing the need for kickstarters then.
Stuff like Acid Rain, a completely original idea, definitely have my attention... Even the price, I guarantee I cave on one of those BIG walkers at some point. I've not hesitated to drop more than that on my 1/16 RC tanks. And while those are huge, moving, shooting, light/sound behemoths, I can totally get into Acid Rain's walker vehicles because the material crosses over to Star Wars well enough I can BS it into my Rebel arsenal or whatnot, and it's gorgeous manufactured stuff.
I think big accessories (step below a diorama IMO) have a little more traction but really, I think most people have that manufactured vs. garage kit mentality.
I'm seeing that with a new model kit line I've gotten into... Lots of resin kits coming out, and lots of resistance to those. Some love them, despite the cost, and others just say it's not "real".
To each their own... If all you wanted was a sci-fi looking hallway for a backdrop though, there's a model line already makes one. It's interlocking, can expand any direction (up/down, front/back, left/right), and even has accessory arm things to plug into walls, it can be made to make large rooms or small rooms... even octagonal hallways or square... whatever. I'm into that myself, but I know I'm the minority and I have to get it at a price I want to get it at for sure. I have my ceiling on anything from Hasbro to garage stuff... especially when I can make some of it myself, the same way, for far less.