Seriously, whose idea was this?
Instead of some bullshit 3072P (not 4k!) , which looks worse than 1080P(on youtube) and no consumer device is even capable of displaying at native resolution even with sufficient bitrate, why not double or triple the bitrate for HD content?
Btw, 4096x3072 is a 4:3 resolution, which as you know, is a poor choice for widescreen content(most/all HD) since a great deal of the resolution may go to waste.