oh, blizzard, you plot like a teenage Twilight fic writer.
So Jaina is trying to say she can't kick out the Sunreavers, Dalaran is their home too and the Alliance and Horde work in harmony there. Meanwhile, the cutscene just shows a bunch of belfs hanging out together - no Alliance in sight. And don't forget how Alliance automagically gets booted out of the Sunreavers' Sanctuary if they try to go there! (I haven't gotten a Hordie to Dal, so I don't know if the same happens Horde-side.)