The problem is that when you get to that state there's not a single obvious way to proceed. Pretty much whatever you do (reset, reboot, Realms-shaking event) will upset some chunk of your fans. (snip) [/quote
That's true.
I think the diehard Realms fans and those who thought the OGB was, originally, a breath of fresh air are essentially united in preferring a reset to the OGB and something closer to Ed's original vision.
Unfortunately, R A Salvatore's books sell about a hundred times as many copies as any FR RPG book so the timeline has been advanced largely to keep RAS and his fans onside. And that's a business decision.
(snip) If I were WotC, I think I would detail the events of The Sundering then spin on the clock a decade or more, and then do a new "Grey Box" version of the Realms that presents the world as it is now, with the events of the Sundering tucked away in the History section as something that happened, but not tightly wound into the whole setting.
What that gives is a sort of "soft reset" - new people can just jump in without worrying too much about canon; fans of the ongoing story can just carry on from there; and people who hate the various RSEs can just ignore them and get on with their games. Plus, each group can use as much or as little of the lore as they wish, and can probably adjust it to suit themselves as well. That's probably about as good as they're going to get.
I wouldn't be surprised if that's actually what we see. Get the turgid dreck of the RSEs out of the way - both The Sundering and the Tyranny of Dragons - and then have a short break in the timeline, et voila, we now have the new campaign setting. WotC has been on record as saying there will be no more RSEs but I suspect that will last until 1 January 2015....