As this story is losely based on the "Count of Monte Christo" I don't see any other way than to revolve around Emily's past and her desire to take revenge. I could see a second season with some backfiring of her plans and definitely her possibly waking up from the trip she is on.
I'd like to see Emily/Amanda coming to terms with her past and finding a way to live with it without being eaten up inside by her wish to take revenge.
But I am more enclined to be surprised as for now I'm perfectly happy how things are stringing along. I do hope they stay on track with this show.
They said that after the 13th episode the main focus would be the aftermath of the murder we saw at the start of the pilot,but that's still part of Emily/Amanda's plan for revenge on the Graysons whether or not the shooting itself was.
If things get too nasty we might eventually see revenge plans against her by those who suffered from what she did.I'd rather that if it outlasts the main arc being tied off in a reasonable time frame that she become a sort of "Equalizer" settling scores for other wronged people.