I hope they get rid of them. They make the handheld in ergonomic and ruined the amazing wiiu controller scheme they had. I have never had a good time using joycons and they cause too much compromise.
They should keep support so things like ring fit work, but they need to go or not be made for kind of symmetric 2 player.
It is very hard to get low resolution small oled screens. Cell phones use pentile displays that are about 60% the actual RGB resolution of the input they need. You would be looking at it needing to be outputting in the 4k range on a 1440p ish display to use off the shelf parts.
If you wqnted to have a 1080p RGB oled it would need to be about 11" and that is too big. It would also have burn in issues with any reasonable brightness.