I am pretty sure we could easily get 4k recording with decent, artificial depth-of-field (LIDAR & all) under decent lighting conditions (which is why this can be done cheap) at a price point of 100 to 200$. Just nobody seems to be doing it.
And yeah we definitely do stream 1080p over meetings and most people are always like "Oh wow, what kind of webcam are you using". That's for my years old logitech... The bitrates are pretty low, even for 4k. You can definitely have a couple of those over almost any current internet connection without issues.
My main gripe is depth-of-field. Add some LIDAR and I am happy. Apple webcam anyone?