I have DM'd in the Realms for a very long time. I even played a few short adventures there. Finally, as per my Sig, I have helped to create an online gaming world that uses the Realms as its Setting.
BUT, as per the second or third post in this thread, WotC has taken the stance that the Realms will be a Fantasy Literature setting. There is apparently a substantial profit to be found in this niche and the Realms are doing it for them.
Unfortunately, the side-effect is that the Realms are too detailed. This is driven further home by the Historians that run rampant in all FR Forums and Lists. They will make the casual observer believe that DM's and Player's WANT this kind of detail in a Fantasy Setting. The truth is that Literature Enthusiasts (or, as I call them, Historians of the Realms) are the ones that primarily want this type of stuff.
Fortunately, the current business regime has realized some of the failures of their past and started work on more generic gaming info. I believe they will find that the well-written, generic gaming product (that fits into any world) will prove to be much more in demand then the the FR Specific stuff. In addition, new DM's will not be so intimidated to join the FR Fold, because only a couple of books will be needed to get up to speed.
Alas, the remnants of the old regime still exist and they will no doubt infect some of the others with their belief's. So, I harbor little hope that this will remain true for long=(
Jones