This shouldn't either. The article states that any game released after the 4.5 streets will run at increased graphical settings on the newer system but will still RUN on current systems. Any game currently out can be patched to run at a higher resolution or FPS on the new hardware but will be done via patch by the developers at their discretion.
We could, but if they keep changing the tech that those games are played on, developers have to spend their time writing for a new system rather than making better games.
I think you might be confused, the same game will be developed to run on the same architecture, just at 2 levels of graphical capability. One higher than the other. I hope that helps clear it up.