We need an Echo Show with HDMI out.
This is the killer device that everyone is looking for. Echo Show is great, but the screen is too small. Sound is great from the Echo Show itself so you wouldn't need to use the TV sound, thus avoiding feedback issues etc. due to latency in the TV. Two way video calling is a lot different with a big screen, enabling family conversations and a more natural experience than you get when handholding a device.