Huh. That's very good news, all told.
Well. She guesses the original timeline was, uh- sort of carefully in balance. The kind of place where you could realistically have centuries of slow conflict without anything like a victor, where Imperial technological progress was just slow enough not to tip the setting on its head. And you don't need much to tip things into slow upward motion instead.
Also, the arrival of the Draenei with their Naaru will hopefully set the stage well for the arrival of another new power relatively well. This is suddenly the kind of thing in recent history books, and thus probably more real-seeming.
Well, things having happened in the history books didn't stop people from thinking near-identical events were impossible and fundamentally unserious to even contemplate back home, so maybe that's a bit too hopeful.
Still, very very good news.