Of all the current races that could possibly be considered allied, they probably make the most sense. The only other contenders I can think of would be pandaren and maybe humans to a lesser extent.
I don't think they would be the most popular choice but it would still be nice to have the option, especially if they give them something really cool like they are supposedly doing with the new trolls.
I kind of have a hard time believing they would though. That would mean that either we get another dwarf as the allied race or they just give it to the regular dwarves; (this may no longer be a thing now) but hasnt blizz said they want to avoid giving any one race access to all classes?