Can't see this being a thing that actually works with game engines until at least 2030 as it would require a lot of advancement and very powerful hardware to run it in real time. Also I'd imagine making it compatible with a specific engine could be a nightmare or impossible in some cases, but having it work with something like Unreal Engine would probably be a lot easier.
Improving visuals of old games is cool, but would be nice to see AI model that can also improve animations and physics too. It's crazy to think that future generations can play dated 3D games and make them look and play it like a modern game with a click of a button while we have to pay $70 for half assed remasters/remakes of those games, lol.