I had not considered the angle you are presenting, MEK. It would appear that, if my theory of an extra being that exists on a level beyond humanity is correct, there would be two such beings: one of Dust, that created Humanity; and one of Shadow, that created the Grimm.
No, let me correct myself: there would be at least two such beings. The source of the Silver Eyed Warriors would not necessarily be attributed to either being, although it quite firmly feels like it belongs to the one that is backed by Dust. Furthermore, it would support the "Light versus Dark" motif that seems to be building itself into a defining theme of RWBY.
Multiple beings, huh?... Whether it be a God or a Demon, odds are Salem has a Backer. Giving Ruby a Backer, the equal and opposite to Salem's, would be a considerable balancing factor, especially since those on the side of Light are more likely to sacrifice themselves entirely than those on the side of Dark (not using those as parallels for good and evil in this instance, by the way).And then there's still the Wizard, the origin of the Maiden powers, to factor into this too... A third Backer seems to be more and more likely, now that I think about it.
Of course, this is going somewhat off the main topic for this thread. Considering that I believe Salem to be supporting an entity beyond the realm of human causality, it is entirely possible that Salem's goal is the utter destruction of the world. Hmm, that brings something to mind... what happened to the moon, and could it be related? Is that even the moon, or is Remnant its moon? If so, what happened to the former denizens of that world?...
Bah, I went off topic again. Apologies!
So, back to Salem's potential plans. Acquiring a Maiden under her beck and call would allow her to reveal the existence of the Maidens and give a rather huge target for them to attack; if she chose the time and place that the ensuing battle would take place, she would enable a good many civilians to be caught in the crossfire. Rumors would spread slowly, due to the lack of the CCT, but they would get around eventually and be distorted by the number of people it would take to spread them. Panic would spread, and Humanity would turn against each other entirely.
That may have been Salem's original plan, but this current arc, a lack of communication and the threat of war between Atlas and Vale... well, a good plan succeeds even when it fails, after all. Salem may have accomplished some of her initial goals, even if her plan didn't proceed entirely as she thought it would...