Actually, I think that lots of Realms fans would thank you for correcting the popular misconception that the Realms is a world ruled by long-armed do-gooder powers. The central-northern Realms has really only one strong, centralized, well-ordered kingdom (and that was torn to pieces in the buildup to 3e): Cormyr. The Moonsea, the Cold Lands, the Vast, the Western Heartlands, and especially the North are *definitively* PoL (i.e. classic D&D) settings, and the Dalelands aren't all that much better given the huge unexplored, elf-abandoned forest sitting astride them. For that matter, most areas in which "civilization" is present (Amn, Calimshan, the Lake of Steam, the Dragon Coast, the Tashalar, Thay, Mulhorand, Unther) are decadent and/or dominated by evil powers.
Which all goes to say that PoL sorta is the default D&D setting. WotC's spelling this idea out seems to be of a piece with the spelling out of PC class and monster roles: It's something that's always existed in the game, but they're just making it explicit, perhaps for the benefit of new gamers?