I know there's a bunch of Nintendo nerds on HN that would play emulated games on their switch but how many switch owners actually want to play old games? There's a lot of kids out there that like playing new games that have modern graphics and gameplay. There are plenty of handheld or console devices out there that can emulate old games but none of them ever sell that well. Nintendo has spent some resources developing the emulators but it likely died when they realized it wouldn't sell that well and that many games would be unavailable unless Nintendo felt like relicensing games from publishers that are owned by competitors.