A high quality 4k stream is about 20mbit/sec. 16k resolution would only have 16x the amount of pixels. Assuming bitrates scale proportionally to resolution, that would only be 320mbit/sec.
So if you want to max out a 1tbit connection, you would need something closer to 900k resolution.
So if you want to max out a 1tbit connection, you would need something closer to 900k resolution.