I was wrong
I'm not sure what the spoiler rules are, so I made the entire post "dark."
I have to admit, I am very surprised by this. My reading of the "points of light in darkness" default setting was that it was already an accurate description of huge swaths of the Forgotten Realms. The North, the Moonsea region, the Swords Coast, the Dalelands, etc. are very sparsely populated, and even the Cormyrian country-side (not to mention Amn's ogre invasation, or Tethyr's collapse) are only loosely claimed by the local "authorities." I figured a simple change in tone, emphasizing the long and perilous rodes between Waterdeep and Silverymoon would be enough to bring FR "within the range" of the acceptable 4e feel.
Man, I hate these world-changing events that totally break the continuity of the settings. Dark Sun Revised, Dragons of Summer Flame, the Time of Troubles .... nothing good ever comes of this stuff.
I think this is a major mistake on WotC's part ... but I was wrong once, so it's possible I'll be wrong again.
You know what this really means though, don't you? Now the 3e FRCS is totally "wrong", and no mixing of 3e and 4e materials. It's just too different.