D&D Tactics for the PSP came out in 2007 and is a better D&D adaptation than NWN2, it's actually turn based and follows the rules more closely. It also gets bonus points for not being set in the Sword Coast.
After that it's just been utter dross though, it's incomprehensible why WotC let the license go to waste for so long.
Cool shit, never heard of that game. A cross between the FFT descendant SRPGs and accurate DnD rules sounds hella dope tho.
As for why WOTC let the license rot, I just think they invested heavily into mobile gaming. There are dozens of dead mobile games noone has ever heard about on the Wikipedia page for DnD games. A failed Gambit cooked up by the minds of soulless corporate drones.