Of course, that might be qualified by single "active" display: the one you re looking at, being the active one. For example, look at the Mission Control setup on Mac. Set up 10 screen if you wish with apps on all 10 screens. You can only really focus on one at a time, so have the active computing going on that one screen. In the background, Mac is processing things happening on those other screens but your eyes aren't seeing things happen there because you are currently focused on- say- screen #3 of 10.
Now shift to screen #7 of 10. Whatever has been running on that screen updates the screen to current and now actively processes on that screen. #3 is frozen (still image) of where you left it until you switch back to it. OR maybe in moments of downtime when you are doing nothing on screen #7 but just reading something on the screen like an email, other screens in the periphery get still image updates of what they would look like if you were focused on them now.
I believe this is as plausible as how Mission Control works now. It doesn't require active 4K streams to every screen but only the one on which Vpro user is currently focused. All others could be like off-screen Mission Control screens are on any Mac.
Will it actually be this way? Who knows? But it seems like it COULD work like this if Apple chose to make it so. Open iPad apps basically update their screens when you switch to them. This might just have more space to show those static screenshots in the periphery while one looks at the main screen.