Nah just get one of these in the backyard.
https://www.skyskan.com/products/systems/projection/8k
As a positive, the cost of that PC will be negligable compared to the 'screen' :)

So, the days of 8K are already upon us!

It's still just 8k, which means most likely 9:16 ratio.

Nah 16K is what's new
http://www.tweaktown.com/news/53163/amd-radeon-pro-graphics-card-powers-16k-display-15-360-8640/index.html

Actually that's a year old already.

It's a dome projection with 150 degree fov, what else can you wish for!
(Doubt the game supports that though)

I wonder how much further we'll go! There's got to be a point where it's indestinguishable from real life, doesn't there?

We'll need 3D holographic displays for that. And even then, it will be a while until you can feel the sun shining through the screen or feel the glow of a fire. Resolution wise, the upper limit is somewhere between 150 and 200 pixels per degree. So 16K per eye for a 100 degree fov VR headset is indistinguishable from real life resolution wise.

Wonder how long it will take to get the hardware for 2x16k into a wireless headset. Probably a bit. I mean there should be a technology that can render very high resolutions fast by approximating nearby pixels instead of calculating each.

looks ok

With foveated rendering it's probably already possible. You only see sharp in 2 degrees of your visual field with visual acuity rapidly diminishing to only detecting motion and light / dark. So for a 16k display, you only need 320x320 at full sharpness, the rest can be upscaled more and more agressively.

You'll need a bit more to stay ahead of pupil movements and a fast way to accurately scan your gaze, yet as you see in the picture, rendering a whole 16k display all the time is a huge waste of resources. The higher res the display, the less you have to render!