Uh, we'll see in 5 years? Is there purple ray on the horizon, or are you planning on "upscaling" your blurays? Do you even have a viewing angle to take advantage of 4k, let alone 8k? I would bet a lot of money that you don't. Heck, do you even enjoy the full benefit of 1080? How far do you sit ADTG?
So, IMO, this is rather pointless, for 99% of us. Most people can't even fully resolve 1080p with their viewing angle, and that includes 99% of AHers.
I have a pretty immersive setup, and there is absolutely no pixelation that can be detected. You have to get pretty darn close to see it. It's a very big screen. I don't have any more space to fit in a football stadium sized screen.