There's still one more movie to go, folks. For all we know, Snoke's back story might still be revealed in the final chapter for those who are pissed about his limited role so far. Abrams mentioned in a recent interview that he's looking forward to the challenge of tying up all the loose ends. Even if Snoke isn't completely explained, I have a feeling they'll at least address some of those questions, perhaps in flashbacks like we saw with Luke in VIII. Or maybe Luke shows up as a force ghost and fills in some of the story a-la Obi-Wan Kenobi in Empire/Jedi.
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