Was reading the novels and i realized one thing...
Before orcs and humans, orcs were all separeted clans. They united against one common foe(The draenei), and became the Horde.
The humans were pretty much the same, separated by their kingdoms, until the horde common(the common foe) and they formed the Alliance.
Now, we have been fighting the Lichking, Deathwing and even Garrosh together. Alliance and Horde soldiers side by side. It's hard to think that at least the footman, minor soldiers and adventurers that fought alongside unknown other soldiers haven't developed some kind of friendship, respect or whatsoever with races of other factions.
And apparently in WoD, we are doing it again. united against an Invasion from another world. i don't think the leaders would merge together or even disband the horde or the alliance to form a completely new thing. But after many battles, i think one race would tolerate the other. But still we can't speak with players of other factions, can't trade, can't do dungeons and raids with then.
My point is: isn't about time the we can actually have groups, raids... maybe even guild members of opposite factions? or at least communicate and trade with them?
Maybe it could be a Quest of learning the orcish/common language, presenting yourself to the opposite faction leader who would congratulate you for your efforts on protecting azeroth and trying to maintain peace.
Not like the Human would be jumping around Orgrimmar and stuff, but if you want to, you can have a orc friend and get along with him and do dungeons and raids together. No need to change factions or stuff just yet.
Much like Orgrim and Durotan were friends. They did all kinds of stuff(no homo) together, while clans used to be totally separated.
oh well, just a tought i was having there while scrolling the forums and decided to share with the community. Thanks for reading anyway! Sorry for any bad grammar.