Do the posted changes reduce the effectiveness of the IT spam knight? To me personally I'm not going to say it's dead, but it will certainly take a bit of a hit with the change. Having IT damage reduced by 20% overall is a huge number (10% reduced from Black Ice, 15% reduced from IIT, 5% increase from Guile) and will certainly drop it's numbers quite a bit. Not to mention that means that frost strike will take a 5% hit as well (If I'm doing my math correctly, 10% reduction from black ice, 5% increase on guile).
That being said does this relegate frost DK's to go strictly unholy sub spec'ed? I know the spam knight's primary dps is a combination of IT and FS (with FS being the most damage of course) but now with the reduced damage of IT by so much does it make this spam spec fall behind? Has anyone done any testing? Personally I'd say if this really affects a spamknight a lot then there is no reason to sub blood as frost.