If the 9th gen consoles launch with BC in 2020, is there any reason to produce 8th gen consoles beyond 2020?

[Bofferbrauer2]

The NVidia RTX 2080 came out a couple months ago. Is there any reason NVidia produce other cards, as they are all weaker?

Might seem dumb, but that's exactly the kind of argument you're using here. And of course there will be a couple reasons:

1. Much cheaper. An XBO or PS4 will be about half the price, if not even less, than their successors.
2. The general public probably doesn't know about the backwards compatibility, either.
3. The proposed $300 Xbox next probably won't come at launch. What's the point of having a console that's weaker than the One X when the latter would still be selling? They'd rather just make next gen games run on the X, much cheaper.