To argue that 4E isn't an MMO is like arguing that the Earth is truly flat.
The problem with Forgotten Realms is WotC force-fed the generic 4E lore down its throat so they can bring every campaign setting into uniformity.
It's 4E that is killing FR. You want players to be interested in the RP and the lore of FR again? Go back to the days of 2e TSR when there were thousands of words in small font embracing each page of those books, little art, little mechanics, and pure lore. That's what made FR the famous campaign setting that it is. And now it's reduced to an MMO with next-to-nothing lore spread out between huge chunks of game mechanics and tiny articles in Dungeon Magazine.
Remember Faiths&Avatars, Shining South, Lands of Intrigue, the Savage North and many more, filled to the brim with lore. Even side-books like Code of the Harpers, Draconomicon, and Cult of the Dragon.
We don't see material like that anymore, instead we see books written with material that drive players to only care about the mechanics and the dungeon grinding.
4E's method of designing the game was a mistake from the beginning. The failing market for 4E, which is evident in every action WotC has been taking as of late, is proof of that.
Let's not forget the thousands that gave up on FR after the 100 year change and the 4E force-feeding. It's on a slow death. It's best bet of staying alive is to sell or license it to a game company that cares about it. (Paizo and their Pathfinder rules for FR would be wonders!)