People ate up the switch oled. I've heard a ton of people who already had a switch say they bought one. Sales numbers are also pretty good I think? If they just call it a Switch 4K or something people will definitely buy one. I think you're mistaken about both the insane popularity of the switch, and also the demographic that uses nintendo handhelds. They've frequently done refreshes with the gameboy and DS lines, and people buy them because they can hand off the old one to a family member or friend.