The camera should be behind the screen. A cheap APS size 5Mpixel and a zoom lens are my ultimate setup. The sensor would have huge pixels that work in low light

The camera should be behind the screen. A cheap APS size 5Mpixel and a zoom lens are my ultimate setup. The sensor would have huge pixels that work in low light. With OLED this should be feasible, I guess. APS (or even full-size 24x36mm) would give small depth of field with little need for background blurr. A big bump on the back are the least of my worries. The ultimate setup would be completed with - 43” curved 4k or 8k, not panorama - build in color calibration - optional monitor hood - HiFi speakers left & right, bass at the bottom - build in directional microphone(s) - lamps on all sides to lighten-up face at night - (servo-) optical zoom out, e.g. for 2 attendees - sensor(s) that detect color temperature pointing behind the screen and adapts screen & lamps accordingly - able to share parts of the screen, eg half or quarter - works with all OS-es: mac, linux & windows - build-in bluetooth hub for keyboard, mouse & headset - 3.5mm headset jack in multiple locations, e.g. left, middle & right - input for studio quality microphone - support for attaching 2 or 3 computers - USB-C Power Delivery up to 240Watt each simultaneous - 10Gbit network switch to USB-C for each simultaneous - switch all inputs & outputs in one-go, without plug-and-play events at each switch - able to swivel and adjust height - mechanical switch to turn off camera & microphones - lasts 20 years I don’t expect this to be ever made, but I keep on dreaming :-)