I don't think problem is with bandwidth, there are 2 problems:
1) expensive webcam devices which would be able to take 4K frames at 30-60 FPS especially at low light conditions.
2) it would take pretty much CPU usage.
I just did a test yesterday and while my webcam Logitech C910 with i5 CPU:
1) 640x480 (0.3k): ~30 FPS, stable video and FPS
2) 800x600 (0.48k): ~30 FPS, image is better, FPS is a bit unstable but fine
3) 1280x960 (1.2k): ~6-7 FPS, clean image even on full-screen resolution, but it is choppy
4) 1600x1200 (2k): ~1FPS, unacceptable quality
I have a regular PC and USB webcam not optimized for video streaming and with fast PC and good webcam we could have 1k video at good quality, but it is too early for 2k and 4K.
For now 0.3k-0.5K used in most cases.
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