It would make for an excellent retro console system emulator, and there's a not-small market for that.Won't happen any time soon
- Apple TV works with all the major console controllers and the excellent 3rd party (e.g. 8bitdo) controllers
- Even if Apple includes an A19 chip
- It will still likely struggle to produce acceptible AAA game image quality and frame rate/times on a 4k display
- The flash storage would likely be mostly filled up by 1 AAA game
- If Apple bumped the specs to an M4 chip & 256 GB storage - that's called a Mac Mini and costs $599