I'd say a military dictatorship doesn't necessarily mean "blue horde". If anything, that's as much of a divergence as you can get. It would just lead to a conflict with a more chaotic, but well-meaning Horde and a traditionally Evil Empire-style Alliance getting to finally have some comeuppance. I think Horde have been wanting to be the good guys in a conflict for a while, while the Alliance have finally wanted to garner a few glorious victories.