> I suspect we're reaching peak open floor plans right now
I doubt it simply because it's way way cheaper to have open floor plans than rooms. Savings on materials, easier compliance with fire safety, way higher density.
Worked a place where a third of our office had 20ft ceilings and we were running out of space for people.
I used to joke that Ikea sold queen sized bunk beds (I dunno if they still do, but they did then), and that we could totally get a desk up on top of one of those...
One day someone will look up and notice that whole unused third dimension in the office.