Actually, no chemist wasn't completely right. He doesn't like consoles, I get that but that's not what this thread is about.
Also, It is unfair to judge people who play console games. They are playing them, you are not and that's ok. Nothing more needs to be said of it.
Back to the original point: It has nothing to do with selling original XBOX games!!!!! They don't care about that, in fact they offer several of them for purchase on XBOX live and they are not stopping that. All they said is they were dropping multiplayer support for those games. You will still be able to buy them you just won't be able to play them online. Again, considering that there are literally only 4 or 5 people playing anyone of those games online this is understandable.
It's not like on the PC where as long as 4-5 people pay for their own server they can still play a classic game. Live is the only venue for playing anything on consoles.
So cutting multiplayer support for original games just frees up some stuff to better support the rest of what they do enable on xbox 360.
As for what Natal has to do with this, that's just the interviewee trying to stir up some excitement about what they are about to release. It has nothing to do with anything lol.
I hope that clears up the confusion and clarifies what is actually happening with this.