ROFL at the idea that IWD2 killed cRPGs. There is a lot of game history as to why the genre died, and it has nothing to do with the quality of IWD2.
In the year 2000 the PS2 released, and became huge. Rumors were circulating that Microsoft was making a console. Sega left the hardware business because they knew they couldn't compete with Sony, Nintendo, and MS simultaneously. Meanwhile on PC we were at the tail end of a golden age. An era of great RPGs, RTS games, shooters, and so on. The PS2 actually hurt the PC market badly, and when the Xbox (more the 360) released some more PC gamers left. Even more left with the 360 imho, but I don't have the numbers. The developers on PC that foresaw the changing of the winds made moves to make console games. Bethesda and Bioware in particular. Thus they quit making PC cRPGs, and focused on a bigger market. The devs that didn't see what was happening, or didn't move fast enough to move to console in time, went under. Examples Interplay and Troika. There was a lonely 3rd category of developer though, and they released a game in 2004 that made them immune to this whole situation. IE Blizzard made WoW.
Oh, and another PC dev survived by creating a unified patching system for their, and other company's titles. This was Valve and Steam. Epic started making Console games, idSoft made the move with Doom 3, and so on and so on. However, if it weren't for Valve I don't know if PC gaming would have survived. I like to think so, but I am unsure.
Consoles killed western cRPGs, not IWD2. Also, NWN2 came out after IWD2, and even though it isn't an IE game... It's still a cRPG.
Watch any interview about the death of Interplay and Black Isle, or an interview about Troika. They all mention the move to consoles. It has much more bearing on the death of the genre than IWD2 could ever dream to.
Also, IWD2 is great. I dare anyone to make a game that good, and that big, in 9 months. Those devs deserve high praise for it.