I'm mainly upset how it's going to get swept under the rug for things. The Alliance and Horde becoming buddies probably for saving world from XYZ evil forces. Pulling a move like this would scar a society and likely trigger bigger panic. The game's not portraying that too well. At least the PTSD Jaina's giving off makes her a 'crazy bitch' for wanting any sort of retribution. Blegh.
tl;dr Great move by Garrosh. However Blizzard isn't finishing ties or lingering issues with it like a lot of other good lore bits. I want to see or know about what happened to the people that went to Taranis. What if some of the Horde intercepted them and slaughtered the bunch? The only reason we don't have many civilian deaths is thanks to Baine's warning. Not because Garrosh had a soft heart.