Honestly if Blizz did this smartly they could yeah solve a lot of problems with the Forsaken right there. Also potentially justify how new Forsaken can continue to be made in 10.0 onward.
But I still have this nagging fear they won't and instead the Scourge will just disappear and the Forsaken will somehow keep showing up. And when asked why Iron won't touch the lore and just say "Well we weren't going to remove a playable race."